Climate Change: Action by States To Address Greenhouse Gas Emissions

Prepared for Members and Committees of Congress

In the absence of a federal climate change program, a number of states have taken actions that
directly address greenhouse gas (GHG) emissions. States’ efforts cover a wide range of policies.
Although much of the early activity was largely symbolic, the more recent state actions have been
more aggressive.
Twenty-three states have joined one of the three regional partnerships that would require GHG (or
just carbon dioxide) emission reductions. Set to take effect in 2009, the Regional Greenhouse Gas
Initiative (RGGI) is a partnership of 10 Northeast and Mid-Atlantic states that creates a cap-and-
trade system aimed at limiting carbon dioxide emissions from power plants. Seven western states
(and four Canadian provinces) have formed the Western Climate Initiative, which set an
economy-wide GHG emissions target of 15% below 2005 levels by 2020. In addition, six states
(and one Canadian province) signed the Midwestern Greenhouse Gas Reduction Accord, which
aims to establish a multi-sector, GHG cap-and-trade program in the Midwest. The latter two
programs are still in the early development stages; RGGI is on schedule for 2009, and
participating states have already held one emission allowance auction.
California has addressed GHG emissions on several fronts. To complement its statewide
emissions reduction regime, California established GHG performance standards that would
effectively limit the use of coal-generated electricity in California. In 2004, California issued
regulations to reduce greenhouse gases from motor vehicles. At least 16 other states have
indicated they intend to follow California’s new vehicle requirements. In addition, the state has
also taken action to reduce the carbon intensity in its transportation fuels.
Predicting the precise consequences of the state-led climate change actions is difficult. Some
actions, particularly the mandatory emission reductions, may create economic effects, especially
in the automotive manufacturing and electricity-generating sectors. Industry stakeholders are
especially concerned that the states will create a patchwork of climate change regulations across
the nation. This prospect is causing some industry leaders to call for a federal climate change
program. If Congress seeks to establish a federal program, the experiences and lessons learned in
the states may be instructive.
Although some states are taking aggressive action, their possible emission reductions may be
offset by increased emissions in states without mandatory reduction requirements. This is perhaps
the central limitation of state climate change programs in actually affecting total greenhouse gas
emissions. Legal challenges represent another obstacle for state programs, particularly for the
more aggressive, mandatory programs.

Introduc tion ..................................................................................................................................... 1
Mandatory Programs to Reduce Greenhouse Gases........................................................................3
Regional Activities....................................................................................................................3
Regional Greenhouse Gas Initiative...................................................................................4
Western Climate Initiative..................................................................................................7
Midwestern Regional Greenhouse Gas Reduction Accord.................................................7
Individual State Efforts Requiring GHG Reductions................................................................8
Economy-Wide Reduction Initiatives.................................................................................8
Emission Reduction from Power Plants............................................................................10
Emission Reduction from Motor Vehicles........................................................................12
Other Mandatory Programs...............................................................................................13
Greenhouse Gas Emissions Targets...............................................................................................16
Greenhouse Gas Emissions Tracking............................................................................................18
Federal Tracking Programs.....................................................................................................19
State Emission Tracking Programs.........................................................................................19
Mandatory Greenhouse Gas Reporting.............................................................................19
Greenhouse Gas Registries...............................................................................................21
Greenhouse Gas Inventories.............................................................................................22
State Action Plans..........................................................................................................................22
Issues for Congress........................................................................................................................23
Potential Effects of State Actions............................................................................................24
States as Policy Laboratories............................................................................................24
Possible Economic Effects................................................................................................25
Patchwork of Regulations.................................................................................................26
Limitations of State Actions....................................................................................................26
Figure 1. Regional Activities to Control Greenhouse Gas Emissions.............................................4
Figure 2. Comparison of Observed Emissions from RGGI Facilities (2000-2007) to
RGGI Cap (effective in 2009)......................................................................................................6
Figure 3. States with Completed (Orange) and Under-Development (Blue Lines) Climate
Change Action Plans..................................................................................................................23
Table 1. Statewide Greenhouse Gas Targets Compared with Emissions Data from 1990
and Recent Years of Available Data...........................................................................................17
Table 2. Top-Ranked Carbon Dioxide Emissions by Nation, U.S. States, and U.S.
Regional Partnerships (2005 data).............................................................................................24

Author Contact Information..........................................................................................................27

Over the past century, particularly in recent decades, scientists have documented increases in
global temperature and sea levels, decreases of sea ice in the Arctic, and melting of continental
ice sheets and mountain glaciers. There is increasing evidence that human activities are at least 1
partially responsible for some of these effects. This is based upon the combination of two
conclusions. First, global temperature increases are linked in some manner to the measurable 2
increases of greenhouse gas (GHG) concentrations in the atmosphere. Second, human activities
(e.g., fossil fuel combustion, industrial processes, and deforestation) have contributed to the
increased concentration of GHG emissions in the earth’s atmosphere.
The link between GHG emissions and climate change has motivated efforts to achieve reductions
of emissions. In 1992, the United States ratified the United Nations’ Framework Convention on 3
Climate Change (UNFCCC), which called on industrialized countries to initiate GHG reduction.
However, in early 2001, President George W. Bush rejected the UNFCCC 1997 Kyoto Protocol,
which called for legally binding commitments by developed countries to reduce their GHG
Over the past decade, the federal government has promulgated or proposed a variety of voluntary
and regulatory actions that, while not specifically seeking to reduce GHG emissions, may have 4th
yielded emission reductions as a byproduct. In the 110 Congress, Members introduced multiple
bills to address climate change issues in some fashion and enacted several pieces of legislation 5
that contained climate change provisions.
In recent years, there has been some congressional support for a mandatory reduction program.
For example, the Senate version of the Energy Policy Act of 2005 included a “sense of the 6
Senate” Resolution stating:
It is the sense of the Senate that Congress should enact a comprehensive and effective
national program of mandatory, market-based limits and incentives on emissions of
greenhouse gases that slow, stop, and reverse the growth of such emissions at a rate and in a
manner that, No. 1, will not significantly harm the U.S. economy and, No. 2, will encourage
other action and key contributors to global emissions.
Members in the 110th Congress introduced multiple bills that would have established some type
of a mandatory emissions reductions program. One of these proposals—the Lieberman-Warner

1 This report does not address the debates associated with the climate change science nor the role of human activity. For
more information, see CRS Report RL34266, Climate Change: Science Update 2007, by Jane A. Leggett.
2 For example, carbon dioxide, the primary GHG, has risen worldwide from 280 parts per million (ppm) to over 380
ppm over the past 150 years.
3 The United Nations Framework Convention on Climate Change (UNFCCC) defines GHGs to include carbon dioxide,
methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride.
4 For example, federal programs that promote energy efficiency or the use of renewable energy sources have the
potential to reduce GHG emissions.
5 For more details regarding this legislation, see CRS Report RL34067, Climate Change Legislation in the 110th
Congress, by Jonathan L. Ramseur and Brent D. Yacobucci.
6 Senate Amendment No. 866 to H.R. 6, passed by voice vote June 22, 2005. A motion to table the amendment was
rejected by a roll call vote (44 - 53).

Climate Security Act of 2008 (S. 2191/S. 3036)—was reported by the Senate Environment and 7
Public Works Committee (December 2007) and debated in the Senate in June 2008.
In the absence of action by the federal government to establish a national program that directly
addresses GHG emissions, a number of states (and local governments, whose activities are not 8
covered in this report) have taken action in this arena.
States’ efforts cover a wide spectrum, from developing climate action plans to setting mandatory
GHG emission standards. Arguably, early state actions were largely symbolic. In the late 1980s, 910
Vermont and Oregon were the first states to set GHG reductions goals, but during the
subsequent decade (1990-2001), both states increased their GHG emissions: Vermont by 18% and 11
Oregon by 30%. However, a majority of states have more recently begun to develop their own
climate change strategies or policies, with an increasing number of states adopting or proposing
more significant provisions, including mandatory GHG reductions.
The motivating factors for the various states’ actions may be as diverse as the actions themselves.
Some actions are motivated by projections of climatic changes, such as sea level rise or
agricultural impacts. Some states view their GHG policies as economic opportunities. States want 12
to position themselves for a “less-carbonized” future, by promoting, for example, alternative
energy supplies, particularly sources available in-state. Other states champion GHG reduction
policies because of the possible co-benefits: improved air quality, reduced traffic congestion, and
less reliance on foreign energy supplies. Another motivating factor for state action is the
possibility of catalyzing federal legislation.
This report covers state actions that directly and explicitly address GHG emissions (see the text
box below). First, the report describes the different types of state actions, both individual and
cooperative efforts, that are either proposed or under way, and highlights several of the more
significant developments. Second, the report examines state actions from a federal policymaking
perspective, including both the potential effects of state-led actions and their limitations.

7 For more information on the progress and details regarding this legislation, see CRS Report RL33846, Greenhouse
Gas Reduction: Cap-and-Trade Bills in the 110th Congress, by Larry Parker, Brent D. Yacobucci, and Jonathan L.
8 A number of local governments are pursuing activities that may directly or indirectly reduce GHG emissions. For
example, numerous local governments (cities, counties) in at least 35 states have joined the Cities for Climate
Protection (CCP). Participating entities commit to reduce local emissions that contribute to global warming. For more
information on this program, see
9 Vermont Executive Order 79 (October 23, 1989) called for a 15% reduction below 1989 levels by 2000. See U.S.
Congress, Office of Technology Assessment, 1991, Changing by Degrees: Steps to Reduce Greenhouse Gases, p. 327.
10 Oregon Senate Bill 576 (1989) set a goal of 20% reduction of 1988 levels by 2005. See U.S. Congress, Office of
Technology Assessment, 1991, Changing by Degrees: Steps to Reduce Greenhouse Gases, p. 327.
11 See World Resources Institute, Climate Analysis Indicators Tool, at
12 See Rabe, Barry, 2006, “Second Generation Climate Policies in American States: Proliferation, Diffusion, and
Regionalization,” Issues in Governance Studies, The Brookings Institution, August 2006.

Direct Action Versus Indirect Action
Direct state actions that address GHG emissions include laws, regulations, or policies that are established explicitly to
reduce GHG emissions. In some cases, it is difficult to draw a line between direct and indirect actions, because a
specific policy may be undertaken for multiple purposes, including GHG reduction. One of the best examples of this
ambiguity is a Renewable Portfolio Standard (RPS). An RPS requires that a certain amount or percentage of electricity
is generated from renewable energy resources (e.g., solar, biomass). Twenty-nine states have a mandatory RPS.
Although GHG reduction is not the primary driver for an RPS in most states, some states list their RPS as part of a
comprehensive strategy to reduce GHG emissions.
Indirect actions are often characterized as “no regrets” approaches, providing net benefits regardless of the
magnitude of their impacts on climate change. For the purposes of this report, indirect actions are those developed
primarily to address other concerns, such as improvements in energy efficiency, energy security, or air quality.
Examples of indirect actions include:
Building codes: A majority of states have building codes that promote energy efficiency in commercial and
residential structures; many of these states’ standards are more stringent than federal policy.
Appliance Standards: Twelve states have set energy efficiency standards for appliances that are not covered
under the federal program.
For the above statistics and more information, see Pew Center on Global Climate Change, States and Regions, at
[]; and EPA, at [].

Mandatory programs to require GHG reductions represent the most aggressive end of the state
action spectrum. As with state actions overall, these programs can vary significantly in scope,
stringency, and design. Mandatory programs are generating considerable interest and some
controversy. This section discusses the different types of mandatory programs and highlights the
regional initiatives and individual state actions that are currently in effect or under development.
Arguably, the most significant action on the state level in recent years has involved the
development of regional agreements to address GHG emissions. As of the date of this report, 23
states have joined—more states are acting as observers—one of the 3 regional partnerships that
would require GHG (or only CO2) emission reductions (Figure 1). Except for the partnership
between 10 northeastern states, the regional activities are still in their developmental phases.
Moreover, the western and midwestern regional partnerships were initiated by state governors and
may not be approved and/or implemented by the relevant state legislatures.
In addition, the regional agreements may raise legal issues, particularly constitutional concerns.
Article I, Section 10, Clause 3 of the U.S. Constitution states that “[n]o State shall, without the
Consent of Congress ... enter into any Agreement or Compact with another State, or with a
foreign Power.... ” In particular, two of the regional agreements include Canadian provinces.
However, it is uncertain whether this clause (the “compact clause”) will create legal hurdles for
any of the agreements.

Figure 1. Regional Activities to Control Greenhouse Gas Emissions
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Western Climate InitiativeMidwest Accord00000000000000000000Regional GHG Initiative
Source: Prepared by CRS.
Note: Figure 1 only includes states that are participants in the regional agreements. Several states are acting as
observers in the initiatives in their regions.
One of the more significant climate change developments at the state level is the Regional
Greenhouse Gas Initiative (RGGI, pronounced “Reggie”). RGGI has been under development
since 2003, when states from the Northeast and Mid-Atlantic regions began to discuss setting up a
cooperative effort to reduce carbon dioxide emissions. Subsequent meetings and workshops
culminated in a Memorandum of Understanding (MOU) that was signed in December 2005. 13
RGGI is a market-based effort by 10 states—Connecticut, Delaware, Maine, Maryland, 14
Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, and Vermont—to reduce
carbon dioxide emissions from power plants. RGGI would set up the nation’s first mandatory 15
cap-and-trade program for carbon dioxide.
The initial objective of RGGI is to stabilize current carbon dioxide emissions from power plants
in RGGI states, starting in January 2009, followed by a 10% reduction by 2019. A primary
strategy of RGGI is to create a program with flexibility, so that in the future other emission
sources/sectors, GHGs, or states could be included.

13 Maryland Governor OMalley signed RGGIs Memorandum of Understanding on April 20, 2007, making Maryland
the first state that was not an original RGGI participant to join the regional initiative.
14 Massachusetts and Rhode Island were involved in RGGIs development from the beginning. However, both states
governors declined to sign the Memorandum of Understanding in 2005, citing costs as their primary rationale for not
participating. Massachusetts and Rhode Island joined RGGI as participants in January 2007.
15 In a cap-and-trade system, regulators set a cap (or limit) on the overall emissions of a given gas from a specified
group of sources, such as power plants. The emissions allowed under the new cap are then allocated in the form of
credits (or permits) to individual sources. Sources that emit more than their allowance must buy credits from those who
emit less than their allowance, thus creating a financial incentive for sources to reduce their own emissions. For more
information on cap-and-trade systems, see EPAs website at

Some observers consider RGGI to be a possible test-case for a federal cap-and-trade program,
and thus several of RGGI’s design elements are generating interest and debate. For example, one
specific feature—the emission allocation scheme—is drawing both praise and criticism. In both
RGGI’s Memorandum of Understanding and its Model Rule, states agreed that at least 25% of 16
emission allowances will be allocated for a “consumer benefit or strategic energy purpose.”
Since then, all of the states have indicated—either through legislation or rulemakings—that they
intend to allocate more than 25% of their state’s emissions allowances for various purposes 17
related to those two overarching objectives.
This allocation strategy requires power plants to purchase the allowances through an auction, 18
instead of receiving them at no charge. On September 25, 2008, RGGI participants held the first
emission allowance auction related to climate change mitigation. Six RGGI states—Connecticut,
Maine, Maryland, Massachusetts, Rhode Island, and Vermont—sold allowances for the first 19
RGGI compliance period (2009-2011). By many accounts, the auction was successful: the
clearing price as $3.07/ton (60% higher than the reserve price); compliance entities received 20
about 80% of the allowances; and states received nearly $40 million in revenues.
Although RGGI is one of the more aggressive state programs addressing climate change, the
program has received some criticism and may face upcoming challenges. For example, recent
emissions data indicate that the RGGI cap—188 million short tons of carbon dioxide—will most
likely be higher than actual emissions, when RGGI goes into effect in 2009. The cap was set
slightly above (about 4%) the average emission levels observed between 2000 and 2002. RGGI
designers anticipated that emissions would gradually increase, so that actual levels would
approximately match the cap in 2009. Although emissions increased in 2007 from their relatively
dramatic decline of 2006, emissions data from the first half of 2008 are similar to 2006 figures, 21
suggesting that 2008 emission are unlikely to increase further; another estimate projects that 22

2008 emissions may go as low as 150 mtCO2, approximately 20% below the 2009 cap.

16 See RGGI Model Rule, issued August 15, 2006, p. 42; and RGGI Memorandum of Understanding, Section G(1),
signed by participating state governors December 20, 2005, both available at
17 Environment Northeast compiled a summary of the states’ plans regarding emission allocation, at http://www.env-
18 For more discussion regarding these issues, see CRS Report RL34502, Emission Allowance Allocation in a Cap-and-
Trade Program: Options and Considerations, by Jonathan L. Ramseur.
19 All 10 states intend to sell a portion of their allowances in a subsequent auction December 17, 2008.
20 For more details, see thePost-Auction Reports,” at
21 Environment Northeast, Emissions Trends and the Inaugural Allowance Auction (September 2008), at
22 Point Carbon, RGGI’s First Auction: Will Short-term Expectations Prevail? (September 2008).

Figure 2. Comparison of Observed Emissions from RGGI Facilities (2000-2007) to
RGGI Cap (effective in 2009)

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00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18C
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
Observed Emissions (2000-2007)
Emission Cap (starting in 2009)
Source: Prepared by CRS with data from the following: observed state emission data (2000-2006) provided by
RGGI; 2007 data provided by Environment Northeast. Note that Environment Northeast generated its data
from EPA’s Clean Air Markets data, at
If actual emissions are below the cap when it goes into effect, the effectiveness of the RGGI
program may be impacted. The allowance price might drop to such a low level that facilities 23
would have no financial incentive to make reductions beyond their required allocation. This
potential problem may be alleviated by the opportunity for affected sources to bank emission
reductions for future use, when the cap will likely be lower than expected emissions. The RGGI
program allows unlimited banking. The ability to bank reductions effectively spreads the costs of
emission reduction over time. Banking emissions would reduce compliance costs in the future,
but also increase the value of current allowances (because they can be sold later). The incentive to
make additional reductions would remain. The recent auction sales data support this notion, as the
clearing price was above the reserve price.
In addition to allocation concerns, a critical design detail—electricity imports from non-RGGI
states—is arguably unresolved. This is often described as the “leakage” problem. Leakage can
occur when an emissions reduction program does not include all sources contributing to the
environmental problem. For example, if a RGGI state lowers its emissions by importing more
power from a non-RGGI state, the emissions reductions in the RGGI state may be offset by an
emission increase in the exporting state. A RGGI working group issued a final report on leakage
March 2008. Among the four recommendations, the working group concluded that states should
monitor for emissions leakage and evaluate whether more aggressive measures—e.g., carbon 24
adders, procurement emissions rates, or load-based caps—should be considered at a later date.

23 This problem occurred during the first phase of the European Union’s Emission Trading System. For more
discussion see CRS Report RL34150, Climate Change and the EU Emissions Trading Scheme (ETS): Kyoto and
Beyond, by Larry Parker.
24 See RGGI Emissions Leakage Multi-State Staff Working Group to the RGGI Agency Heads, Potential Emissions
Leakage and the Regional Greenhouse Gas Initiative (RGGI), (March 2008), at

Seven U.S. states and four Canadian provinces are participating in the Western Climate Initiative 25
(WCI). WCI got off the ground in February 2007, when the governors of six western states—
Arizona, California, Oregon, New Mexico, Utah, and Washington—agreed to reduce GHG 26
emissions in their region. Montana and the four Canadian provinces—British Columbia, 27
Manitoba, Quebec, and Ontario—joined at later dates. The states and provinces set a regional,
economy-wide target to reduce GHG emissions to15% below 2005 levels by 2020. In order to
implement this target, the participants agreed to develop a market-based program, such as a
“load-based cap and trade program.”
In September 2008, the WCI developers issued design recommendations for meeting the emission
reduction goals. The recommendations include a cap-and-trade system that would cover
emissions from electricity generation and large industrial and commercial sources in 2012. In

2015, the program would cover emissions from the transportation sector and fuel consumption 28

from residential, commercial, and industrial uses not otherwise covered. The recommendations
also include flexible design elements, such as unlimited emission banking, three-year compliance
periods, and offsets, which may satisfy up to 49% of the emission reductions. Although this
number may appear relatively high compared to federal cap-and-trade proposals, limiting offsets
by percentage of reductions is different from limiting offsets as a percentage of allowance
submissions (as many federal proposals would do). As a comparison that may provide additional
context, RGGI participants agreed to a similar principle: at least half of the reductions should
come from covered sources, thus allowing offsets to cover up to 50% of reductions. To apply this 29
principle, RGGI designers allow offsets to satisfy up to 3.3% of a compliance submission. In
contrast, most federal proposals would allow domestic offsets to satisfy at least 15%
(international offsets often add a further percentage) of a covered sources allowance submission.
Although the WCI is still in early development, there are several issues that may hinder its
implementation. As noted, the WCI is an agreement between the states’ governors. To implement
the program, the states’ legislatures would need to enact laws to carry out the initiative’s
objectives. This may present an obstacle if a state’s legislative branch finds fault with the
reduction program developed by states’ executive branch officials.
On November 15, 2007, the governors of six states—Illinois, Iowa, Kansas, Michigan,
Minnesota, and Wisconsin—signed the Midwestern Regional Greenhouse Gas Reduction

25 For the text of the agreement, see
26 Utah joined the initiative May 21, 2007; the five other states were charter members, signing the agreement February
26, 2007.
27 Montana joined January 2008; British Columbia signed April 2007; Manitoba signed June 2007; Quebec joined April
2008; Ontario joined July 2008.
28 See Western Climate Initiative, Design Recommendations for the WCI Regional Cap-and-Trade Program
(September 2008), at
29 The 3.3% figure is based on an estimate of reductions needed to meet the emissions cap. RGGI developers estimated
that, compared to a business-as-usual estimate of emissions, covered sources would need to reduce emissions by
approximately 6.6% (on average) through 2012, at which time the program would undergo a comprehensive review.
Thus, the percentage my change based on updated estimates. For a further explanation of RGGIs offset rationale, see

Accord.30 The Premier of the Canadian Province of Manitoba also signed the Accord, potentially
raising the same legal issues discussed above.
The Accord does not establish discrete GHG emissions targets, but directs the participating states
(and their relevant state agencies) to set their own GHG emission reduction targets. In order to
meet these GHG emission targets, the Accord calls for the participants to develop a cap-and-trade
program and a model rule by November 2008. Although draft recommendations were made
available November 2008, the time line was amended by the participants: a draft model rule is 31
now scheduled for September 2009.
The participants agreed that full implementation of the Accord will be completed by May 2010.
Although not full participants in the Accord, the Governors of Indiana, Ohio, and South Dakota
signed on as observers, agreeing to participate in the formation of the regional cap-and-trade
Individual state efforts that seek to reduce GHG emissions cover a range of activities. Outside of
regional agreements, several states currently require power plants to make GHG emission 32
reductions or submit offsets. Other states are developing “economy-wide” GHG emission
reduction programs. Multiple states are planning to adopt California’s motor vehicle standards for
GHG emissions. In addition, states are working on other mechanisms that would require GHG
emission reductions. These state efforts are discussed below.
Three states—California, Hawaii, and New Jersey—have passed legislation that lays the
groundwork for “economy-wide” reduction programs. In general, the state statutes lack critical
details regarding the design of the reduction programs. Instead, the statutes direct state agencies
to develop the logistical elements that would implement the reduction requirements. However,
these programs vary substantially in their progress of development, the California program being
well ahead of the other programs. These programs are described below.
In September 2006, California enacted landmark legislation—AB 32 or the Global Warming 33
Solutions Act—that would establish a comprehensive GHG reduction regime. The legislation is
far-reaching in principle, but does not include many crucial details. Instead, the act directs the
California Air Resources Board (CARB) to develop and implement a statewide program that
would reduce the state’s GHG emissions to 1990 levels by 2020.

30 The text of the Accord is available at
31 For more details, see the Accords website at
32 Also described as statewide or multi-sector, “economy-wide” GHG emission reductions programs seek to control and
reduce emissions from several economic sectors. In general, these programs cover the sectorse.g., electricity
generation, industry, and transportationthat account for the vast majority of a state’s emissions. Depending on the
design of the program, some sectors (e.g., agricultural or residential) may be excluded.
33 California Governor Schwarzenegger signed the legislation September 27, 2006.

The statute grants considerable authority to CARB, which is charged with determining critical
details concerning the framework and applicability of the program. For example, the law does not
specifically require the use of a market-based system, such as a cap-and-trade program, to reduce
GHG emissions. Instead, AB 32 authorizes CARB to develop regulations to “achieve the
maximum technologically feasible and cost-effective GHG emission reductions.... ” Moreover, 34
the statute does not include a list of regulated emission sources or categories, but instructs 35
CARB to determine which sources are necessary to meet the statewide target.
The statute does dictate a schedule for various agency deadlines. The following dates highlight
significant milestones of the mandatory schedule:
• June 30, 2007: Identify the early reduction options, which can be implemented
prior to the mandatory program, and for which a facility will receive emissions
credit. In October 2007, CARB submitted its final report of early actions, which 36
are to be implemented via regulation and enforceable by January 1, 2010.
• January 1, 2008: Establish the 1990 baseline, which becomes the 2020 emissions 37
cap. A baseline estimate is a critical determination for a cap-and-trade program.
On December 7, 2007, CARB approved a baseline of 427 million metric tons of
carbon dioxide equivalent (mmtCO2e).
• January 1, 2008: Develop a mandatory reporting scheme for sources that will
covered by the cap. Sources report emissions for four years in order to establish
accurate facility baselines. CARB submitted regulations for approval to the 38
Office of Administrative Law in October 2008. The regulations would require
the first emissions reports to be submitted in 2009 based on 2008 emission 39
• January 1, 2011: Finalize regulations, including possible market-based programs,
that will implement the statewide emissions cap. Related to these efforts, the 40
Scoping Plan was prepared in October 2008 and awaits approval from CARB.
• January 1, 2012: Implement and enforce the mandatory emission reduction
program created in 2011.

34 Earlier drafts of the legislation specifically cited the electric power, oil/gas, and cement industries, and landfills as
significant emitters.
35 The statute instructs CARB to regulate mobile sources if the 2004 mobile sources regulatory program (described
above) does not remain in effect (presumably due to legal challenges).
36 CARB, Expanded List of Early Action Measures to Reduce Greenhouse Gas Emissions in California Recommended
for Board Consideration (October 2007), at
37 Past estimates of 1990 levels ranged from a low of 425 mmtCO2e to a high of 468 mmtCO2e. This is a 10% variance
between low and high estimates. See California Energy Commission, Inventory of California Greenhouse Gas
Emissions and Sinks: 1990 to 2004Final Staff Report, December 22, 2006, p. 4.
38 This office has until December 2, 2008, to make a determination. For updated information, see
39 According to CARB, the reporting regulations will account for approximately 94% of the total CO2 produced in
California from industrial and commercial stationary sources of emissions. See
40 See

In June 2007, Hawaii enacted the Global Warming Solutions Act of 2007, mandating statewide
GHG emissions reduction to 1990 levels by 2020. The statute establishes a GHG emissions
reduction task force, which is directed to offer policy recommendations by January 1, 2009.
Before December 31, 2011, the Department of Health is instructed to adopt implementing
regulations that would take effect January 1, 2012. Similar to California’s statute, Hawaii’s act
does not specify details, but gives considerable responsibility to the Department of Health. The
act does require the Department of Health “to endeavor to make the requirements consistent with
the requirements of international, federal, and other states’ greenhouse gas emission reporting 41
programs, as necessary.”
In July 2007, New Jersey enacted the Global Warming Response Act, which states that GHG
emissions shall be reduced to 1990 levels by 2020 and to 80% below 2006 levels by 2050. The
statute instructs the Department of Environmental Protection (DEP) to develop a GHG emissions
inventory for the baseline years—1990 and 2006—and a system for monitoring and reporting
GHG emissions from specific sources (e.g., electricity generators), as well as entities deemed to
be significant emitters by the DEP. The law does not specify how the reductions will be met, but
directs the DEP, in coordination with other agencies, to submit recommendations to the governor 42
and state legislature. In response to this provision, the DEP prepared a report November 2008.
However, unlike the California and Hawaii statutes, the New Jersey act does not grant specific
authority to DEP to implement the reduction program through regulation. Although not
specifically stated, further legislative action would likely be required to implement the reduction 43
A sector-specific approach that focuses on carbon dioxide is relatively easier to implement than
an economy-wide program that includes multiple GHGs. The electricity-generating sector is often
considered a primary candidate for emission reduction, because in most states electric power 44
plants account for the highest percentage of carbon dioxide emissions. Many of these facilities
are already tracking their carbon dioxide emissions as required by the 1990 Clean Air Act.
Both Oregon and Washington have programs that require new power plants to reduce carbon
dioxide emissions or purchase offsets. In 1997, Oregon became the first state to regulate carbon

41 Section 8 of the act, revising Hawaii Revised Statute § 342B.
42 New Jersey DEP, New Jersey Greenhouse Gas Inventory and Reference Case Projections 1990-2020 (November
2008), at
43 According to an official with the NJ DEP, existing statutory authorities may allow some regulations to move forward
without additional legislative action. However, subsequent legislative action is most likely necessary to implement the
reduction regime in full (per telephone conversation, August 28, 2007).
44 Based on 2001 data. Energy Information Administration, Emissions of Greenhouse Gases in the United States 2004
(Table C2).

dioxide emissions by passing legislation45 requiring new power plants to equal or exceed carbon
dioxide levels that are 17% below the best natural gas-fired plant in the nation. Plants can either
reduce emissions directly or purchase offsets from a nonprofit organization (the Oregon Climate
Trust) that was established with the 1997 law. This organization helps develop various projects
that will reduce or sequester GHG emissions. These projects generate the pool of offsets available
(by purchase) to the power plants. So far, all of the new facilities have chosen to purchase offsets 46
instead of reducing onsite emissions. Washington passed similar legislation in 2004, requiring 47
new power plants to offset 20% of their carbon dioxide emissions.
These states have established emission reduction requirements at existing power plants:
• Massachusetts: In 2001, Massachusetts became the first state to take formal
action on carbon dioxide emissions at operational power plants. As part of a
multi-pollutant strategy, which went into effect in 2006, the state’s six largest
power plants must reduce carbon dioxide to levels consistent with those produced 48
in the late 1990s. In 2008, this cap was lowered further. The program allows the
plants to either make the reductions, demonstrate offsite reductions, or purchase
emissions credits from other verifiable sources. Note that the carbon dioxide
components of this program will be superceded when RGGI goes online in 2009.
RGGI will require reductions from 32 power plants in the state.
• New Hampshire: In 2002, the state enacted multi-pollutant legislation49 requiring
its three fossil fuel power plants to reduce carbon dioxide to 1990 levels by the
end of 2006. In order the meet the cap, the law allowed sources to bank early
reductions or buy credits through other programs deemed acceptable by state
officials. The carbon dioxide elements of this program also will be superceded by
In June 2008, Florida enacted legislation that authorizes the Florida Department of Environmental 50
Protection to craft a cap-and-trade system that would cover the electric utility sector. Pending
subsequent approval by the state legislature, the cap-and-trade program would go into effect in


45 HB 3283, codified in Oregon Administrative Rules, Chapter 345, Division 24.
46 Point Carbon, 2006, “Carbon Trading in the US: The Hibernating Giant,Carbon Market Analyst, September 13,
47 HB 3141 (signed into law on March 31, 2004).
48 310 Massachusetts Code of Regulations 7.29.
49 New Hampshire Clean Power Act (May 9, 2002), codified in New Hampshire Statute, Title X, Chapter 125-O
(Multiple Pollutant Reduction Program).
50 HB 7135, signed into law June 25, 2008.

The U.S. transportation sector accounts for a substantial percentage—26% in 200651—of the
nation’s GHG emissions. Automobiles and light-duty trucks (fueled by gasoline or diesel) 52
generate the majority—62% in 2006—of the nation’s transportation-related GHG emissions.
The transportation sector is the single largest source of the primary GHG, carbon dioxide, in 17 53
California’s transportation sector, in particular, generates almost 41% of the state’s annual 54
greenhouse emissions. California is in a unique position regarding the regulation of air
emissions from motor vehicles. It is the only state with conditional authority (i.e., the state needs
a waiver from EPA) to develop motor vehicle pollution standards that are more stringent than 55
federal requirements. The federal Clean Air Act permits other states to choose to follow 56
California’s more stringent provisions, and states have adopted California standards in the past.
In 2002, California enacted the first state law (AB 1493) requiring GHG limits from motor 57
vehicles. As directed by the statute, the California Air Resources Board (CARB) issued
regulations in September 2004, limiting the “fleet average GHG exhaust mass emission values 58
from passenger cars, light-duty trucks, and medium-duty passenger vehicles.” The fleet average
caps first apply to model year 2009 vehicles. The caps become more stringent annually, so that by

2016, the fleet average would be 30% below the 2009 level.

At least 16 states have formally adopted or announced plans to follow the California regulation.59
In order for the states to implement this standard, California must receive a waiver from the EPA.
California requested a waiver (as required by Section 209 of the Clean Air Act) in December
2005. In December 2007, EPA decided to deny the waiver request. EPA’s decision is being
challenged in court—by California and other states, and environmental groups. For more
discussion regarding this issue, see CRS Report RL34099, California’s Waiver Request to Control
Greenhouse Gases Under the Clean Air Act, by James E. McCarthy and Robert Meltz.

51 EPA, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2006, Executive Summary (2008), at
52 The transportation sector also includes emissions (in descending order) from heavy-duty trucks, aircraft, boats, and
trains. EPA, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2004 (2008).
53 Based on data from Energy Information Administration (EIA), State CO2 Emissions by Energy Sectors, at
54 California Energy Commission, 2006, Inventory of California Greenhouse Gas Emissions and Sinks: 1990 to 2004,
p. 8.
55 See Clean Air Act Section § 209, codified at 42 U.S.C. § 7543.
56 Clean Air Act § 177, codified at 42 U.S.C. § 7507.
57 AB 1493 (or the California Vehicle Global Warming Law) was signed into law by Governor Gray Davis on July 22,
58 Title 13, California Code of Regulations § 1961.1.
59 The 16 states are Arizona, Colorado, Connecticut, Florida, Maine, Maryland, Massachusetts, New Jersey, New
Mexico, New York, Oregon, Pennsylvania, Rhode Island, Utah, Vermont, and Washington.

Although they do not require emission reductions or offsets from specific facilities or sources,
other mandatory programs may have an impact on GHG emissions. A few states, California in
particular, have recently developed requirements that aim to influence investment in long-term
power generation. These state actions may impact GHG levels by influencing which energy
sources—coal, oil, natural gas, etc.—are used to generate electricity for consumers.
Two states—California and Washington—have enacted laws requiring a GHG emissions
performance standard for applicable power plants. In September 2006, California passed 6061
legislation (SB 1368) forbidding “load-serving entities” from entering into new “long-term 62
financial commitments” with power plants unless a plant’s GHG emissions are as low or lower
than those of a new, combined-cycle natural gas facility. This emissions performance standard
apply to both in-state power plants and out-of-state facilities that seek to export electricity to
California. As directed by the statute, the California Public Utilities Commission (PUC) issued 6364
interim performance standards for investor-owned facilities January 25, 2007. The California 65
Energy Commission’s (CEC) comparable regulations for publicly owned utilities were approved
(by the Office of Administrative Law) in October 2007.
Washington passed similar legislation (SB 6001) in May 2007. Regulations implementing this 66
statute were adopted in June 2008, and went into effect the following month.
The new performance standards complement the emissions reductions programs being developed
in California and Washington. As discussed above, California is developing a mandatory
reduction program, and Washington has a statewide emissions reduction target; both states are
participants in a regional emissions reduction program (WCI). The implementation of California’s
emissions reduction program and the WCI is several years away (irrespective of legal challenges).
The performance standards act as a stop-gap measure, preventing further utility investment in
carbon-intensive fuels while the states develop broader reduction regimes.
Once the new performance standards are applicable (and previous commitments expire), they will
effectively prohibit California and Washington consumers from using electricity generated by
conventional coal-fired power plants. Compared with a combined-cycle natural gas plant, a

60 SB 1368 was signed by the governor on September 29, 2006.
61 Defined as “every electrical corporation, electric service provider, or community choice aggregator serving end-use
customers in the state. SB 1368 (codified in Public Utilities Code, Section 8340(h)).
62 Defined as anew ownership investment in baseload generation or a new or renewed contract with a term of five or
more years, which includes procurement of baseload generation.” SB 1368 (codified in Public Utilities Code, Section
63 In 2003, these facilities accounted for 68% of the electricity consumed in California. See California Energy
Commission, Electricity Consumption by Utility Type, at
64 More information is available at
65 Publicly owned utilities accounted for 27% of California’s electricity consumption in 2003. Self-generation units
made up the remaining percentage (about 5%). See California Energy Commission, Electricity Consumption by Utility
66 More information is available at the Washington Department of Ecology website, at

conventional coal-fired power plant emits more than twice the amount of carbon dioxide. Using 67
current technologies, coal-fired generators would fail to meet the new emissions standards.
From 2002 through 2005, approximately 20% of California’s electricity was generated from 68
coal; approximately 10% of Washington’s electricity came from coal generation facilities over 69
the same period. As the laws take effect, California and Washington will likely need to
reduce/conserve a comparable amount of energy or replace the coal-generated electricity with
alternative sources of power.
The new emissions standards will impact not only California and Washington, but also other
states in the West. For example, California’s electricity imports generally comprise between 22%
and 32% of the state’s total electricity consumption, but its imports are responsible for 39% to 70
57% of the total GHG emissions linked with electricity. This is due to the fact that most of
California’s in-state electricity is produced from sources other than coal, while most of the state’s
imported electricity is generated through coal combustion. Once the standard takes effect, the
coal-fired plants in neighboring states, which previously provided electricity to California, will
need to look elsewhere for customers. The same goes for coal-fired power plants still in
development in western states, which may have been designed, at least in part, to serve California 71
Arguably, the GHG performance standards disproportionately affect the neighboring states that
have historically exported coal-generated electricity to California and Washington consumers.
This possible consequence may raise legal issues, such as a state’s general inability to regulate
interstate commerce.
Montana enacted the Electric Utility Industry Generation Reintegration Act (HB 25) in May
2007. Among other things, the act prohibits the state’s Public Service Commission (PSC) from
providing advance approval of coal-fired electric generating units unless a minimum of 50% of
the CO2 generated by the facility would be captured and sequestered. The PSC promulgated
regulations to implement this standard in March 2008. At first glance, this statute may appear to
be significant landmark in state climate change activity. However, the statute’s applicability is
relatively narrow, effectively applying to only one public utility—Northwestern Energy—in the

67 As technology advances, coal-fired plants might be able to reduce GHG emissions through carbon capture and
sequestration (CCS). However, “there is relatively little experience in combining CO2 capture, transport and storage
into a fully integrated CCS system. The utilization of CCS for large-scale power plants (the application of major
interest) still remains to be implemented.” Intergovernmental Panel on Climate Change (IPCC), 2005, IPCC Special
Report Carbon Dioxide Capture and Storage, Summary for Policymakers.
68 The percentage of California’s electricity generated from coal should decrease, because a large coal-fired plant
(Mohave facility) was shut down at the end of 2005. California Energy Commission, Gross System Electricity
Production, at
69 Washington State Department of Community, Trade and Economic Development, 2007, 2007 Biennial Energy
Report: Issues and Analysis for the Washington State Legislature and Governor, p. 7, at
70 California Energy Commission, 2006, Inventory of California Greenhouse Gas Emissions and Sinks: 1990 to 2004,
Draft Staff Report, p. 12.
71 See Holly, Chris,California PUC Issues IOU Greenhouse Rules; Muni Nixes Coal Deal,” The Energy Daily,
December 15, 2006.

state.72 Moreover, this utility does not own generating units in Montana73 and is unlikely to 74
construct conventional coal-fired plants in the near future. Other power companies in the state
are not subject to this standard.
To complement California’s statewide GHG reduction program, the governor issued an executive
order (signed January 18, 2007) establishing a low carbon fuel standard (LCFS). The LCFS aims
to reduce the carbon intensity of California’s transportation fuels by 10% by 2020. California 75
currently relies on petroleum-based fuels for 96% of its transportation needs. Achieving the
carbon intensity reduction is expected to replace 20% of the state’s gasoline consumption with 76
less carbon-intensive fuels. The LCFS would apply to all refiners, blenders, producers, and
importers of transport fuels.
The order states that transportation fuels shall be measured on a full fuel cycle basis. Thus,
regulators must factor in all of the energy used and potential GHGs emitted during the fuel’s
development (extraction or production), delivery (via vehicle or pipeline), and final use
(combustion). Corn-based ethanol, for example, is expected to play a role in meeting California’s
LCFS. To comply with the full fuel cycle assessment, regulators must consider the energy needed
to produce fertilizers, operate farm equipment, transport corn, convert corn to ethanol, and
distribute the final product. For more information on these issues, see CRS Report RL33290, Fuel
Ethanol: Background and Public Policy Issues, by Brent D. Yacobucci.
The LCFS executive order enhances alternative fuel legislation (AB 1007) that California passed 77
in 2005. AB 1007 requires the California Energy Commission (CEC), in partnership with other
agencies, including CARB, to develop and adopt a State Alternative Fuels Plan. CEC adopted
such a plan October 31, 2007. The executive order directs CEC to supplement this plan with a
compliance schedule for meeting the 2020 LCFS target. The State Alternative Fuels Plan states 78
that CEC will work with CARB “over the next year” to develop a compliance schedule. As of
the date of this report, the compliance schedule remains under development.
Another state action that may affect a state’s sources of electricity generation is the adoption of a
GHG (or carbon) adder. In general, adders require utilities to weigh the future costs of GHG
emissions when considering different energy investment options (e.g., fossil fuels, renewable
energy supplies). For example, California’s Public Utilities Commission requires investor-owned

72 Per conversation (December 1, 2008) with staff from Montana Public Service Commission.
73 See Northwestern Energy website, “About Us,” at
74 Per conversations (December 1, 2008) with personnel from the Montana Public Service Commission and the
Montana Environmental Information Center; and a conversation with personnel from Northwestern Energy (December
3, 2008).
75 Executive Order S-01-07, signed January 18, 2007.
76 California Office of the Governor, The Role of a Low Carbon Fuel Standard in Reducing Greenhouse Gas Emissions
and Protecting Our Economy, January 18, 2007.
77 The governor signed AB 1007 September 29, 2005.
78 CEC, State Alternative Fuels Plan, (December 2007), p. 18, at

utilities to include a value of $8/ton of carbon dioxide emissions when conducting long-term 79
planning or procurement activities. The agency stated that this requirement “will serve to
internalize the significant and under-recognized cost of [GHG] emissions, [and] help protect 8081
customers from the financial risk of future climate regulation.... ” Only a few other states
require some type of GHG adder, and California’s adder may be rendered less relevant due to its
new emission performance standard (discussed above). At this stage, the adders have not been 82
credited with changing any procurement decisions.

State emissions targets are goals by which a state can measure its progress in achieving GHG
emissions reduction. By themselves, state emissions targets do not directly reduce GHG
emissions. The targets are often established by the executive branch of state government (e.g.,
through an executive order) and may not have the support of the state’s legislative branch.
However, a target signals that state officials, at least from one branch of the government, consider
climate change an important issue.
Twenty states have established statewide targets for GHG emissions (see Table 1).83 Three of the
state targets—California, Hawaii, and New Jersey—are mandatory (discussed above). Compared
to the GHG limits and targets set on the international stage in past years, the state targets are less 84
stringent. The New England states’ targets are similar, if not identical, because they are part of a 85
cooperative plan developed in 2001. Of the 20 states in Table 1, Colorado, Illinois, New 86
Mexico, and Utah stand out because they have substantial coal production.
Table 1 compares the states’ GHG emissions in 1990 with emissions from the most recent years 87
of available data. The emissions data show the reductions states would need to make to meet
their established targets. Although some of the states appear within reach of their 2010 targets, the
most recent data from many of these states suggest that emissions are not decreasing, but at best
are leveling off. In some states—e.g., Arizona and Florida—emissions have increased
substantially in recent years. More years of data are needed to evaluate progress, primarily
because many of the states issued their GHG targets after 2003. Moreover, the emissions targets

79 California Public Utilities Commission, Decision 05-04-024, April 7, 2005.
80 California Public Utilities Commission, Decision 04-12-048, December 16, 2004.
81 Oregon and Colorado. See Pew Center on Global Climate Change website, at
82 Pew Center on Global Climate Change, “California PUC Carbon Adder” (case-study).
83 Several states have also developed more narrow targets, either for industry or electricity generation or only for
carbon dioxide emissions.
84 The U.S. Kyoto target was 7% below 1990 levels, averaged over the commitment period 2008 to 2012. For more on
international climate agreements and U.S. involvement, see CRS Report RL33826, Climate Change: The Kyoto
Protocol, Bali “Action Plan,” and International Actions, by Susan R. Fletcher and Larry Parker.
85 New England Governors/Eastern Canadian Premiers, Climate Change Action Plan 2001, August 2001, at
86 In 2007, Colorado, Illinois, New Mexico, and Utah ranked 6th, 9th, 11th, and 12th, respectively, in coal production. See
U.S. Department of Energy, Energy Information Administration Statistics, at
87 The emissions data in Table 1, particularly the 1990 levels, may differ from the official estimates provided by
individual states. The objective of the table is to compare emission levels over time, and assess the challenge of
meeting emissions targets. Because some states only have estimates for 1990 levels, this report uses data from the
World Resources Institute for a consistent comparison.

were typically created in conjunction with GHG reduction policies—some of them mandatory
limits on specific industries or segments of state activities—whose implementation may not be
reflected in the available emissions data.
Table 1. Statewide Greenhouse Gas Targets Compared with Emissions Data from
1990 and Recent Years of Available Data
Greenhouse Gas Emissions
(million metric tons of CO2 equivalent)
State Greenhouse Gases
Target(s) 1990 2000 2001 2002 2003 2004 2005
AZa 2000 levels by 2020; 50% below 70 93 95 94 96 105 107
2000 levels by 2050
CAb 2000 levels by 2010; 1990 levels
by 2020; 80% below 1990 levels 412 442 449 447 453 458 459
by 2050
COc 20% below 2005 levels by 2020
and 80% below 2005 levels by 82 104 108 108 107 111 115
CTd 1990 levels by 2010; 10% below 44 47 45 44 46 48 47
1990 levels by 2020
FLe 2000 levels by 2017; 1990 levels
by 2025; 80% below 1990 levels 208 264 263 267 271 285 291
by 2050
HIf 1990 levels by 2020 23 21 21 22 23 25 26
ILg 1990 levels by 2020; 60% below 231 277 266 268 269 274 285
1990 levels by 2050
MAh 1990 levels by 2010; 10% below 89 88 88 89 92 89 90
1990 levels by 2020
MEi 1990 levels by 2010; 10% below 21 25 25 26 26 26 26
1990 levels by 2020
MNj 15% below 2005 levels by 2015;
30% below 2005 levels by 2025; 99 118 114 117 120 119 123
80% below 2005 levels by 2050
NHk 1990 levels by 2010; 10% below 16 19 18 19 22 23 22
1990 levels by 2020
NJl 1990 levels by 2020; 80% below 124 137 135 135 137 139 144
2006 levels by 2050
NMm 2000 levels by 2012; 10% below
2000 levels by 2020; 75% below 58 66 66 64 66 68 69
2000 levels by 2050
NYn 5% below 1990 by 2010; 10% 233 244 236 230 244 244 239
below 1990 levels by 2020
ORo Stabilize by 2010; 10% below
1990 levels by 2020; 75% below 39 52 52 50 51 53 54
1990 levels by 2050
RIp 1990 levels by 2010; 10% below 10 13 14 13 13 13 13
1990 levels by 2020
UTq 2005 levels by 2020. 60 72 70 68 69 73 75

Greenhouse Gas Emissions
(million metric tons of CO2 equivalent)
State Greenhouse Gases
Target(s) 1990 2000 2001 2002 2003 2004 2005
VAr 2000 levels by 2025 130 143 141 139 143 147 148
VTs 1990 levels by 2010; 10% below 7 8 8 8 8 8 8
1990 levels by 2020
WAt 1990 levels by 2020; 25% below
1990 levels by 2035; 50% below 84 99 100 93 95 99 100
1990 levels by 2050
Source: Prepared by the CRS with data from the following: state targets compiled by Pew Center on Global
Climate Change, at; GHG emissions data from World Resources Institute, Climate
Analysis Indicators Tool, at (GHG data excludes land use changes).
a. Arizona Executive Order 2006-13 (September 7, 2006).
b. California Executive Order S-3-05 (June 1, 2005) set the 2010 and 2020 targets; AB 32 (discussed below)
made the 2020 target mandatory.
c. Colorado Executive Order D-004-08 (April 22, 2008).
d. Connecticut Public Act No. 04-252 (June 14, 2004).
e. Florida Executive Order 07-127 (July 13, 2007).
f. Hawaii Governor Lingle signed the Global Warming Solutions Act of 2007 (Act 234) into law June 30, 2007.
The act mandates statewide GHG emission reductions.
g. Announcement from Illinois Governor Blagojevich (February 13, 2007), related to Executive Order 2006-11
(October 5, 2006).
h. Massachusetts Climate Protection Plan of 2004 (Spring 2004).
i. Maine LD 845 (HP 622) (effective September 13, 2003).
j. Minnesota Governor Pawlenty , signed into law the Next Generation Energy Act May 25, 2007.
k. The Climate Change Challenge (December 2001).
l. New Jersey Governor Corzine signed into law the Global Warming Response Act (A3301) July 6, 2007,
which requires mandatory emission reductions.
m. New Mexico Executive Order 05-033 (June 9, 2005).
n. New York State Energy Plan (June 2002).
o. Oregon Governor Kulongoski signed HB 3543 into law August 6, 2007.
p. Rhode Island Greenhouse Gas Action Plan (July 2002).
q. Announced by Utah’s Department of Environmental Quality (DEQ) on June 20, 2008.
r. Virginia Governor Kaine signed Executive Order 59 (2007) December 21, 2007.
s. This target is discussed in Vermont’s state plan, Fueling Vermont’s Future: Vermont Comprehensive Energy Plan
and Vermont Greenhouse Gas Action Plan (July 1998).
t. Washington Governor Gregoire signed SB 6001 into law May 3, 2007.

Reliable GHG emissions data are a keystone component of any climate change program. To
implement effective solutions to climate change, policymakers need up-to-date and accurate

information detailing the volume and sources of GHG emissions in their states. Precise
monitoring is particularly vital for market-oriented approaches to GHG control. Whether a
market-oriented program is based on tradeable emissions credits or a carbon tax, reliable and
transparent emissions data would be the foundation for developing the allocation systems,
reduction targets, and enforcement provisions.
The federal government has several programs in place that either track or estimate GHG
• Power plants subject to the 1990 Clean Air Act acid rain program must monitor 88
and report to EPA various air pollutants, including carbon dioxide.
• The Department of Energy administers a voluntary GHG reduction registry. This
program started in 1994, pursuant to Section 1605(b) of the Energy Policy Act of 89

1992 (P.L. 102-486).

• The EPA prepares an annual inventory of the nation’s GHG emissions and sinks,
which is submitted to the United Nations in accordance with the Framework
Convention on Climate Change.
Many states have developed, or begun to develop, their own GHG tracking programs. Although
tracking programs may overlap in purpose and terminology, for this report, tracking programs are
divided into three categories: mandatory reporting, registries, inventories.
Mandatory reporting programs allow states to monitor GHG emissions from precise sources.
Although the primary purpose of mandatory reporting is typically to support an emission
reduction program, a reporting program can potentially provide benefits without an
accompanying reduction requirement. For example, if companies’ GHG emissions were made
publicly-available and thus comparable, the companies might have an incentive to reduce 90
emissions voluntarily. However, there is some concern that emissions may increase under a
mandatory reporting program, especially if companies suspect that the state will establish a
mandatory reduction regime in later years. For instance, facilities may attempt to “game” the

88 Section 821, 1990 Clean Air Act Amendments (P.L. 101-549, 42 USC 7651k). For more information regarding
federal programs see CRS Report RL31931, Climate Change: Federal Laws and Policies Related to Greenhouse Gas
Reductions, by Brent D. Yacobucci and Larry Parker.
89 For more information on this program, see
90 This notion is analogous to the arguments in support of EPAs Toxic Release Inventory (TRI) Program, which
requires facilities to submit annual data concerning their releases of chemicals to the environment. The TRI program is
generally considered a success, as releases have decreased since the programs inception. Rabe, Barry, 2002,
Greenhouse & Statehouse: The Evolving State Government Role in Climate Change, Prepared for the Pew Center on
Global Climate Change.

system by deliberately increasing emissions (or over-reporting them) in order to gain additional 91
allowances once a reduction program is established.
A few states already require, and others are in the process of developing, GHG emissions
reporting to complement an emissions reduction program. Some states require reporting of GHG
emissions that are not included in reduction programs. For example, some of the RGGI states
mandate reporting of non-CO2 GHG emissions. In addition, other states currently have a
mandatory reporting program that is not linked with an emissions reduction requirement. Both of
these types of reporting activities are listed below, in the order of when the program started or is
scheduled to start:
• Wisconsin: In 1993, the state established a mandatory reporting program that
includes carbon dioxide reporting for facilities generating over 100,000 tons 92
• New Jersey: Certain facilities in New Jersey that report air pollutant emissions
must also submit emission data for carbon dioxide and methane. This 93
requirement went into effect in 2003. New Jersey is developing a mandatory
reduction program (discussed above) that will entail a more comprehensive
reporting regime.
• Maine: Facilities in Maine that emit any criteria pollutant over a specific
reporting threshold must also report GHG emissions. This provision went into 94
effect July 2004.
• Connecticut: Starting in 2006, facilities subject to federal reporting under Title V 95
of the Clean Air Act must submit GHG emissions data on an annual basis.
• California: See the above discussion regarding the implementation of AB 32,
which includes mandatory GHG emission reporting.
• North Carolina: Facilities with Title V permits (under the Clean Air Act)96 that
submit annual air pollutant emission inventories to the state will be required to 97
include GHG emissions in their 2009 submission (due June 30, 2009).
• New Mexico: Beginning in 2009, all electrical generating units of 25 megawatts
capacity or higher, petroleum refineries, and cement manufacturing plants will be

91 This notion assumes that allowances would be allocated based upon past performance, instead of sold through an
auction process.
92 Wisconsin Chapter NR 438.03.
93 New Jersey Administrative Code 7:27-21.3.
94 Maine Department of Environmental Protection Rules, Chapter 137 (per 38 MRSA, Section 575).
95 Connecticut Public Act No. 04-252 (June 14, 2004).
96 Sources subject to the Title V permit requirements generally include major sources that emit or have the potential to
emit 100 tons per year of any regulated pollutant, plus stationary and area sources that emit or have potential to emit
lesser specified amounts of hazardous air pollutants. See CRS Report RL30853, Clean Air Act: A Summary of the Act
and Its Major Requirements, by James E. McCarthy et al.
97 More information regarding this program is available at

required to report GHG emissions. The initial report will only include CO2 98
emissions; reporting of other GHGs will be required in later years.
• Oregon: In October 2008, the Oregon Environmental Quality Commission
established a GHG emission reporting requirement for entities that emit more
than 2,500 metric tons of CO2 annually. Title V sources will report 2009 99
emissions in 2010; all other sources will report 2010 emissions in 2011.
• Washington: In March 2008, the state enacted H.B. 2815, directing the
Department of Ecology (DEC) to develop a GHG emission reporting system.
Starting in 2010, the statute requires emission reporting from entities that emit
more than 10,000 t CO2 annually and vehicle fleets emitting more than 2,500
tCO2e annually.
In general, state GHG registries are voluntary programs that allow facilities to submit and
officially record emissions data. The states’ voluntary registry programs encourage participation
through incentives. Perhaps the primary incentive is the opportunity for participants to create an
official record of emissions reductions, which the parties hope will count as emissions credits in
future mandatory reduction programs. At a minimum, participants typically receive some public
recognition for their efforts, which may help promote a company’s environmental stewardship
profile. Five states have passed legislation to establish GHG registries, of which three are now 100
under way:
• New Hampshire: The New Hampshire GHG Registry went into effect in 2001.
The registry is intended to record emissions reductions in a state database that
can be used in addressing possible future requirements.
• California: The California Climate Action Registry began operations in 2002.
This state registry is arguably the most comprehensive, as participants register all
of their GHG emissions for operations in California; other state (and federal)
registries cover only emission reductions. The registry has over 100 participants.
• Wisconsin: The Wisconsin Voluntary Emission Reduction Registry, a registry of
voluntary reductions of GHG emissions, went online in 2003.
Numerous states are joining forces to establish a national registry, which may link with regional 101
registries that were previously created. In May 2007, 30 states formed the Climate Registry,
which aims to establish a standard system for GHG emissions reporting. As of August 2008, 39

98 Rulemaking (Title 20, Chapter 2, Parts 73 and 87) from the New Mexico Environment Department, at
99 The Oregon rulemaking is available at
100 The other two states are Maine and Georgia. Maine’s registry is not yet operational, but the state does have a
mandatory reporting requirement (discussed below). Georgia, instead of tracking GHG emissions, established a registry
for counting the offsetting reductions in GHG emissions obtained by carbon sequestration. Not counted as one of the
five states, New Jersey repealed a previously enacted registry program in 2004.
101 New England and Mid-Atlantic states are developing the Eastern Climate Registry. In addition, the Lake Michigan
Air Directors Consortium (LADCO) is working on a registry for several states in the Midwest.

states have joined the registry to support both voluntary and mandatory reporting schemes in the 102
participating states.
At least 42 states have developed GHG inventories. Inventories typically provide estimates of
emissions for various categories: economic sector (e.g., energy, agriculture), emissions source
(e.g., automobiles, power plants), GHGs (e.g., carbon dioxide, methane). In general, states create
their inventories by following guidelines developed by the Environmental Protection Agency
(EPA) that are based on internationally recognized standards. Inventories are often used to obtain
an overall assessment of a state’s emissions levels and sources, and are perhaps best suited for
monitoring trends and/or developing comprehensive strategies. Although some states have
performed inventory updates, most of the states’ inventories only cover 1990 emission levels.

At least 38 states have either completed or are in the process of preparing climate change action
plans (see Figure 3). Typically, state action plans are drafted by a climate change task force,
composed of members with diverse backgrounds and expertise. In general, task force members
examine their state’s sources of GHG emissions, and identify and rank the policy options that are
most appropriate (i.e., cost-effective, politically feasible, etc.) for controlling emissions in their
state. Often the state action plan is made available for public comment, revised if necessary, and
then submitted for approval to state officials.

102 For more information see

Figure 3. States with Completed (Orange) and
Under-Development (Blue Lines) Climate Change Action Plans
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Source: Prepared by the Congressional Research Service with data from U.S. EPA Climate Change Division and
Pew Center on Global Climate. Online links to individual state action plans are available through EPA’s website,
Reflecting the fact that states have different economic sectors, natural resources, and political
structures, state climate change action plans can vary substantially. Some state action plans focus
more on indirect, “no regrets” strategies, such as improved energy efficiency, which will likely
yield benefits irrespective of climate change effects. Other state action plans are more
comprehensive and recommend a portfolio of direct efforts that address GHG emissions.
Although the state climate change action plans may recommend an array of policy options, the
plans do not necessarily result in direct actions to reduce GHG emissions. However, the number
of completed state plans indicates the interest that a majority of states have in addressing climate
change mitigation on some level.

The climate change activity in the states raises several issues that may be of interest to Congress.
This section discusses some of the potential effects of state action in lieu of federal legislation.
This section also examines the limitations of state actions, both from a climate change policy
perspective and in the context of legal challenges.

Many states generate significant emissions of GHGs. If individual U.S. states were classified as
sovereign nations, 18 U.S. states would rank in the top 50 for nations that annually emit the 103
primary GHG: carbon dioxide. Compared with other nations, Texas, the combined Midwest
Accord states, the WCI states, the RGGI states, and California rank as top carbon dioxide emitters
(Table 2).
Table 2. Top-Ranked Carbon Dioxide Emissions by Nation,
U.S. States, and U.S. Regional Partnerships (2005 data)
CO2 Emissions CO2 Emissions
Country, State, or Group (million metric tons) Country, State, or Group (million metric tons)
United States 5,892 Texas 673
China 5,577 RGGI states 643
European Union 4,102 Canada 559
Russian Federation 1,558 United Kingdom 539
Japan 1,249 Italy 477
India 1,222 South Korea 475
Germany 829 Iran 447
Midwest Accord states 813 Mexico 411
WCI states 788 California 396
Source: Prepared by CRS with data from World Resources Institute, Climate Analysis Indicators Tool, at Note that the carbon dioxide data excludes land use changes.
Note: Midwest Accord states include Illinois, Iowa, Kansas, Michigan, Minnesota, and Wisconsin. WCI states
include Arizona, California, New Mexico, Montana, Oregon, Utah, and Washington. RGGI states include
Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island
and Vermont. In addition, the emissions data for China entails some uncertainty. More recent estimates (from
other sources) indicate that China has surpassed the United States in GHG emissions. For more information, see
CRS Report RL34659, China’s Greenhouse Gas Emissions and Mitigation Policies, by Jane A. Leggett, Jeffrey Logan,
and Anna Mackey.
Almost half (23) of the states have joined one of the three regional emission (all GHGs or just
carbon dioxide) reduction programs: the Midwest Accord, WCI, and RGGI. The states in these
regional programs account for a substantive percentage of U.S. carbon dioxide emissions (about
38%). However, the remaining 27 states are pursuing considerably less aggressive climate change
policies. With this range of state activity, it is difficult to predict the precise consequences of
state-led climate change actions. This section highlights possible effects from state actions.
A central argument in support of state climate change action is that states can serve as laboratories
for policymaking. States can test different ideas and policies on a smaller scale, and help

103 This is based on 2005 data from the World Resources Institute, Climate Analysis Indicators Tool, at

determine which climate change solutions are most effective. For example, there has been some
debate regarding how a cap-and-trade program might work on a national level. Although the
federal acid rain program, which involves sulfur dioxide emissions trading, is generally
considered a success, emissions trading programs for other purposes have encountered problems 104
during implementation.State and regional programs offer the opportunity to iron out logistical
details that are crucial in a cap-and-trade system:
• How high to set the emissions cap.
• Which sources to regulate.
• How to allocate emissions allowances.
• Whether to allow the use of offsets as compliance alternatives.
• Whether to include a safety valve and, if so, how high to set it.
State programs can inform federal policymakers in other ways. The political process by which
states create climate change policy can be enlightening and perhaps adaptable on the federal
level. For instance, by examining the development and passage of state legislation, federal
policymakers may better understand the motivations of different stakeholders and learn how best
to frame the issues.
Emission reduction programs will likely have economic effects on consumers, businesses and 105
manufacturers, and possibly interstate commerce.The most immediate effects of the emissions
programs (at least the ones furthest along in development) will be on the automotive
manufacturing and electricity generation sectors.
For automotive manufacturers, the California motor vehicle regulations—which at least 16 states
have indicated they plan to implement if EPA approves the waiver (discussed above)—will likely
have the effect of dividing the market, potentially requiring the manufacture of a different class of
cars to meet the new standards (scheduled to apply in 2009). For automotive companies, this
raises the issues of the technical means of meeting the standard, marketing, ensuring compliance,
and pricing. Depending on how the emission limits are to be met, they may also influence fueling
infrastructure. State governments will need resources to enforce the standards. Consumers in
regulated states may face higher prices for vehicles.
Regarding the electric power industry, the mandatory reduction requirements will likely promote
generation from low carbon-intensive fuels, while curtailing generation from high carbon-
intensive fuels, such as coal. The GHG performance standards in California and Washington will
reach into neighboring states as well, effectively barring electricity imports generated by

104 For example, the Southern California’s Regional Clean Air Incentives Market (RECLAIM), which was
implemented in 1994 to reduce emissions of nitrogen oxides (NOx) and sulfur dioxide (SO2), saw a 50-fold increase in
NOx allowance prices during the 2000-2001 California energy crisis. The European Union’s GHG trading system has
also experienced drastic swings in allowance prices during its start-up years, making planning and decision-making
difficult for participating entities. For additional information on the EU trading system, see CRS Report RL33581,
Climate Change: The European Unions Emissions Trading System (EU-ETS), by Larry Parker.
105 The question of whether and in what circumstances states can regulate interstate commerce may raise legal
questions, which are briefly discussed below.

conventional coal-fired power plants. Because coal-fired plants tend to produce lower-cost
electricity, the result of these requirements may be to increase electricity prices within the states
that limit emissions, and possibly lower prices in states without such emission standards.
If the GHG limitations lead to energy price increases in the regulated states, businesses and
manufacturers may factor this cost into location decisions. There is some concern that regulated
industries will have a financial incentive to move (and thus transfer jobs) to states (or nations) 106
that do not limit GHG emissions. Others fear that emission limits will raise the cost of living
and doing business within those states, although in theory such effects can be at least partially 107
addressed through the design of the emissions reduction program.
One concern shared by many observers, particularly industry stakeholders, is that state climate
change programs (in lieu of a federal program) will create a patchwork of regulations across the
nation. A patchwork system of standards may hinder a company’s efficiency and possibly create
economic burdens for firms that operate in multiple states. The prospect of regulations that vary
from state to state is driving some companies to support a federal climate change program with
comparable requirements across the entire United States.
Climate change has been described as the “ultimate global commons problem.”108 The global
warming and climate impacts associated with increased GHG emissions in the atmosphere cannot
be linked with specific emission sources. Unlike localized reductions in other air pollutants (e.g.,
sulfur dioxide, particulate matter), when an emissions source reduces its carbon dioxide
emissions, it does not generate a corresponding local climate change benefit unless there are
similar widespread reductions globally or at least in wide areas.
From a practical standpoint, the actions of one or a group of states or nations cannot by
themselves reduce the global accumulation of GHG emissions in the atmosphere. However, as
discussed above, actions now under way by many states in the United States may create examples
and/or models that will prove instructive in more widespread applications. Moreover, when
business and industry have confronted a growing patchwork of state requirements, these sectors
have historically begun to favor a national policy—as has begun to happen in the case of state-
level actions on climate change. However, the lack of a national program or a truly global
approach to GHG emissions reductions does limit what individual states can accomplish in
actually reducing GHG emissions and accumulations.
Legal challenges may further limit the effectiveness of state action. The possibility of legal
challenges creates considerable uncertainty regarding the future of state climate change actions,

106 This is also a central argument against having federal emission limits without cooperation with other large
economies (e.g., China and India).
107 A cap-and-trade program with an auction system (as discussed above), for instance, would generate revenues that
could be funneled to parties who bear an unfair percentage of the programs costs. See, for example, National
Commission on Energy Policy, 2007, Allocating Allowances in a Greenhouse Gas Trading System.
108 Stavins, Robert, 2006,A Utility Safety Valve for Cutting CO2, The Environmental Forum, Volume 23, Number
2, March/April, 2006, p. 14.

particularly the more aggressive programs. There are already several lawsuits against state actions 109
that seek to regulate GHG emissions from motor vehicles. As discussed above, the April 2007
Supreme Court decision (Massachusetts v. EPA) did not specifically address all of the plaintiffs’
arguments, so uncertainty remains as to the resolution of these cases.
Further litigation confronting other types of state action is anticipated. However, many expected
RGGI to face a legal challenge when the first state’s rule was officially issued, but that did not
occur. Regardless, there is some question as to whether California’s recently enacted GHG 110
performance standards are constitutional. Arguably, the standards disproportionately impact the
neighboring states that have historically exported coal-generated electricity to California
consumers. The legal arguments in these cases are beyond the scope of this report, but many
observers conclude that it is difficult to predict how the courts will interpret and decide upon
these issues. For a more in-depth analysis of various legal issues regarding climate change, see
CRS Report RL32764, Climate Change Litigation: A Growing Phenomenon, by Robert Meltz.
Jonathan L. Ramseur
Analyst in Environmental Policy, 7-7919

109 For more details, see CRS Report RL34099, California’s Waiver Request to Control Greenhouse Gases Under the
Clean Air Act, by James E. McCarthy and Robert Meltz.
110 See Potts, Brian, 2006, “Regulating Greenhouse Gas Leakage: How California Can Evade the Impending
Constitutional Attacks, Electricity Journal, Vol. 19, Issue 5, June 2006.