According to a 1995 assessment by the IPCC, climate models project that increasing atmospheric concentrations of the primary greenhouse gases--carbon dioxide, methane, and nitrous oxide--and aerosols will raise the average global surface temperature between 1.8 and 6.3 degrees Fahrenheit by 2100. The IPCC estimates that such a temperature increase could lead to many potential impacts, including flooding, droughts, changes in crop yields, and changes in ecosystems. In an effort to address concerns about the possibility of global climate change, the United States and other countries signed the United Nations Framework Convention on Climate Change at the Rio Earth Summit in May 1992. As of June 1996, 159 countries had ratified the Convention. The Convention's ultimate objective is to stabilize the concentrations of human-induced greenhouse gases in the atmosphere at a level that would prevent dangerous interference with the climate system. To accomplish this objective, the Convention directs the Annex I parties to adopt policies and measures to limit greenhouse gases and to protect and enhance the greenhouse gas sinks and reservoirs that absorb and store carbon dioxide from the atmosphere. The Convention also directs the Annex I parties to submit plans to the Conference of the Parties with detailed information on the policies and measures that will help return net greenhouse gas emissions to 1990 levels by 2000. (See app. I for more details on the Convention and a list of Annex I countries.) As of May 1996, 33 of the 36 countries listed under Annex I had ratified the Convention. At the first session of the Conference of the Parties to the Convention held in April 1995, the countries acknowledged that the existing commitments under the Convention are not adequate to meet the overall objective of stabilizing greenhouse gas concentrations. This determination was formally designated by the Conference of the Parties as the Berlin Mandate. To address the inadequacies, the parties agreed to begin a process to define actions in the post-2000 period, including strengthening the commitments of the parties included in Annex I by elaborating policies and measures, as well as by setting quantified objectives for limiting and reducing emissions. The Department of State's Under Secretary for Global Affairs recently announced to the Conference of the Parties that the United States supports the adoption of binding emissions targets beyond 2000. The process of determining actions beyond 2000, designed to include in its early stages an analysis and assessment phase, is scheduled for completion before the third Conference of the Parties, currently set for late 1997. Carbon dioxide is considered the major contributor to global warming. Developed countries--as identified by their membership in the Organization for Economic Cooperation and Development (OECD)--accounted for about half of the world's energy-related carbon dioxide emissions in 1990. The United States was responsible for about 22 percent of the total carbon dioxide emissions. Developing countries are projected to account for an increasing share of worldwide carbon dioxide emissions in the future as a result of their increasing growth in energy demand. For example, the Energy Information Administration estimates that China's share of carbon dioxide emissions will almost double from about 10 percent in 1990 to about 19 percent in 2015. Therefore, even if the developed countries are able to stabilize carbon dioxide emissions, worldwide emissions are likely to increase because of the expected large growth in developing countries. The incomplete, unreliable, and inconsistent data on emissions prevent a complete assessment of Annex I countries' efforts to limit greenhouse gas emissions to 1990 levels by 2000. These problems occurred for several reasons, including a lack of specific reporting requirements by the Convention. As of February 1996, the Convention had compiled data from the national plans of 29 Annex I countries. These countries accounted for 60 percent of the estimated global carbon dioxide emissions from fossil fuel combustion in 1990. All 29 countries reported 1990 data on carbon dioxide, and 28 of the 29 reported similar data on methane and nitrous oxide. However, eight countries did not provide projections to 2000 for at least one of those gases. For example, Spain did not include projections of either methane or nitrous oxide in its plan. Additionally, only eight countries provided projections of the other greenhouse gases also covered under the Convention, such as hydrofluorocarbons. While emissions for such gases are now small, they are projected to increase in the future. Also, some reported data lack precision. Specifically, although countries provided emissions data for methane and nitrous oxide, the level of certainty in such data is low. For example, the uncertainty range for reported methane emissions in Canada's national plan is plus or minus 30 percent at a 90-percent confidence level; the range is plus or minus 40 percent for nitrous oxide at an 85-percent confidence level. In contrast, the uncertainty level for Canada's carbon dioxide emissions was only plus or minus 4 percent at a 95-percent confidence level. Reliability in measuring the emissions data for methane and nitrous oxide is not as high as for carbon dioxide. Because these gases come from many sources and are nontoxic, little effort has been given to measuring their emissions. Additionally, the countries' emissions data were not always consistent. For example, some Annex I countries adjusted their 1990 inventory levels in order to develop what they believed to be a more reasonable starting point for projections to 2000. As a result, a different picture emerges of a country's ability to meet the goal, depending on whether the projections are compared to actual or adjusted 1990 levels. To illustrate, Denmark adjusted its 1990 inventory level upward to show what emissions would have been if imported hydroelectric power had been generated domestically with fossil fuels. Consequently, Denmark's carbon dioxide projections exceed the actual 1990 levels; but when the adjusted level for 1990 is used, the projections for 2000 are below the 1990 level. Two major factors contributed to problems in the Annex I countries' reporting of emissions data. First, the parties to the Convention did not formally adopt reporting guidelines until April 1995--after most countries had submitted their national plans--and the guidelines adopted in 1995 were not specific in all cases. For example, the guidelines did not specify whether emissions' projections were to be reported on the basis of gross emissions or net emissions, which account for the carbon dioxide removed from the atmosphere by forests and other greenhouse gas sinks. Only 13 of 29 Annex I countries separately reported projections of carbon dioxide sinks. The parties to the Convention have recognized shortcomings in the guidance. In its comments on a draft of this report, the Department of State noted that the parties had adopted revised reporting guidelines at their Second Conference in July 1996. These revised guidelines will be used for the second round of national plans due to be submitted in April 1997. The Department of State has stated that these national plans will be significantly improved because of the revised guidelines. Furthermore, it expects that the Conference of the Parties will continue to revise and improve the guidelines. The other major factor contributing to problems with the data on greenhouse gas emissions is that, as previously noted, the countries have not yet been able to quantify with certainty the emissions of methane and nitrous oxide because of the limited reporting data. Although the currently available emissions data prevent a complete assessment of countries' progress in meeting the Convention's goal, projections by energy forecasting agencies of carbon dioxide emissions from fossil fuel use--which is the largest single category of greenhouse gas emissions--indicate that few Annex I countries will likely be able to return emissions to 1990 levels by 2000. Of the major developed countries, only Germany and the United Kingdom appear likely to reduce carbon emissions to 1990 levels by the year 2000. Other major developed countries--including Canada, Italy, Japan, and the United States--will probably not reach the goal. A few other Annex I countries in eastern Europe, such as the Czech Republic, may be able to meet the Convention's goal. The projections by the Annex I countries themselves indicate that only 7 of the 24 countries that provided point estimates of carbon dioxide emissions in 2000 project that they can hold emissions near or below 1990 levels. (See table 1.) For the remaining countries, the increases over the 1990 inventory levels ranged from 1.7 percent to 28.8 percent. The projections from other organizations also indicate that few countries will be able to stabilize carbon dioxide emissions. For example, the Energy Information Administration's May 1996 International Energy Outlook forecasts that carbon dioxide emissions from energy consumption will increase for most of the Annex I countries from 1990 to 2000. Specifically, the agency projects that carbon dioxide emissions will increase 11 percent in the United States, 21 percent in Japan, 18 percent in Canada, and 6 percent in OECD Europe. The International Energy Agency (IEA) also projects increases in carbon dioxide emissions between 1990 and 2000 for Annex I countries. In its 1994 Review of Energy Policies of IEA Countries, published in July 1995, this agency forecasts increases in energy-related carbon dioxide of 10 percent for the United States, 13 percent for Canada, and 8 percent for Europe. On the basis of our review of six developed countries--Canada, Germany, Italy, Japan, the United Kingdom, and the United States--we found that energy use is the major factor affecting the ability of those countries to meet the goal of returning greenhouse gas emissions to 1990 levels by 2000. Therefore, the major factors that affect trends in energy use--such as growth in gross domestic product (GDP), population growth, energy prices, and energy efficiency--also affect trends in greenhouse gas emissions. The ability to shift from coal, the burning of which produces a high level of greenhouse gases, to other fuels is also a major factor. Table 2 provides information on these factors for the six countries we reviewed. (App. II provides additional information on the goals of the six countries in connection with climate change and the status of the additional actions that those countries are considering to help reach the Convention's goal.) In response to the Convention's goal on greenhouse gases, the United States issued its Climate Change Action Plan (CCAP) in October 1993. The plan includes 44 largely voluntary initiatives designed to return net emissions of the major greenhouse gases--carbon dioxide, methane, nitrous oxides, and hydrofluorocarbons--to 1990 levels by 2000. The CCAP aimed to cut the net projected growth of 7 percent in the major greenhouse gas emissions between 1990 and 2000 and to achieve stabilization at the 1990 level of 1,462 million metric tons of carbon equivalent (MMTCE). Without the plan's initiatives, emissions were projected to grow to 1,568 MMTCE. The CCAP laid the foundation for the U.S. national plan submitted to the Convention in September 1994. The United States estimates that it will fall short of its target. Efforts to reduce greenhouse gas emissions in the United States have been hampered by changes in forecasts of key economic variables, such as higher-than-projected economic growth and lower-than-expected energy prices, that differ from the assumptions made in the CCAP. The changes in these economic indicators tend to increase energy use and therefore also increase greenhouse gas emissions. For example, the world oil price per barrel in 2000 was estimated to be $24.04 (1994 dollars) in the CCAP, but the Energy Information Administration's 1996 Annual Energy Outlook--which contains the executive branch's latest forecasts--now estimates that the price will be $19.27 per barrel (1994 dollars). Also, annual population growth is now projected to be higher than expected when the CCAP was formulated--about 1.0 percent per year as compared with the 0.7 percent projected in 1993. Population growth tends to increase energy use and consequently greenhouse gas emissions. (App. III compares in more detail the changes in key economic factors and fuel prices affecting the U.S. efforts.) Officials at the Department of Energy and the Environmental Protection Agency--which are responsible for implementing the bulk of the CCAP actions--noted that the reductions in the funding for the plan also have a substantial negative effect on the United States' ability to reduce greenhouse gas emissions by 2000 by limiting the agencies' ability to implement voluntary initiatives in the plan. For example, in fiscal year 1996, only about one-half of the requested funds were appropriated. Table 3 provides annual budget requests and appropriations for fiscal years 1995 through 1997. Lower estimated prices will, in general, also make the implementation of voluntary initiatives less likely. According to an official with the Council on Environmental Quality, legislation has also precluded the implementation of the few nonvoluntary actions in the plan, such as requiring that tires be labeled for fuel economy. The Council on Environmental Quality, the Department of Energy, the Department of State, and the Environmental Protection Agency are currently revising the CCAP. A new plan is scheduled to be issued in the fall of 1996. Canada's national plan relies primarily on a set of voluntary measures aimed at increasing energy efficiency and conservation and encouraging a switch to less carbon dioxide-intensive energy sources. Because of Canada's high energy-intensity, most of its human-induced greenhouse gas emissions are generated by the demand for energy to heat and light homes, operate industries, and other uses. Factors such as low population density, large distances between urban areas, and a cold climate create unique circumstances that make Canada a highly energy-intensive country. A recent estimate indicates that Canada will likely miss the Convention goal by a significant amount--carbon dioxide emissions are estimated to increase by 18 percent by the Energy Information Administration. The country's high rate of energy intensity, low energy prices, and fast-growing population, among other factors, have contributed to the gap. Japan is also likely to miss the Convention's goal. Japan's Action Report on Climate Change, issued in 1994, estimated that total carbon dioxide emissions in 2000 would exceed their 1990 levels. Current projections by the Energy Information Administration indicate that carbon dioxide emissions in Japan may increase by 21 percent. Over the last 20 years, Japan has consistently consumed one of the lowest percentages of energy per dollar of economic output for developed countries because of energy efficiency programs and initiatives. Therefore, achieving additional greenhouse gas reductions is difficult. As a result, even low levels of growth in the economy and population increase energy use and greenhouse gas emissions. Additionally, Japan had planned to build several additional nuclear power plants that would emit fewer greenhouse gases than the coal-powered facilities they would replace. However, the country has encountered difficulties in siting and building those plants. Italy also is low in energy-intensity as compared to other major developed countries. According to a State Department official, Italy is more energy efficient than other developed countries because of high energy prices and regulations limiting energy use. Therefore, additional energy savings and greenhouse gas reductions may be difficult to achieve, although Italy is forecast to experience a relatively low rate of economic growth. Italy's national plan discusses additional measures to further reduce carbon dioxide emissions, but their impact may be minimal. In its national plan, Italy projects that its carbon dioxide emissions in 2000 will exceed 1990 emissions by about 12.5 percent without additional measures. Germany and the United Kingdom, the only two major developed countries positioned to meet the Convention's goal, are also subject to economic factors that can cause energy use to increase. However, as the result of unique circumstances set in motion before the Convention's goal was established, both Germany and the United Kingdom are likely to meet the goal. According to an official in Germany's Ministry of the Environment, the principal reason that Germany is expected to exceed the Convention's goal is the reunification of the former East Germany with West Germany in 1990. The depressed economic conditions in East Germany, including low productivity levels and high unemployment, and the shift from inefficient coal technology to natural gas are helping to reduce greenhouse gas emissions significantly. For instance, carbon dioxide emissions in the former East Germany have already decreased by about 43 percent from 1990 to 1994. In contrast, during the same period, carbon dioxide emissions increased about 3 percent in what was formerly West Germany. In its national plan, Germany has also sought to achieve the Convention's goal by implementing a broad range of voluntary and regulatory measures aimed at reducing greenhouse gas emissions. Progress in the United Kingdom is largely attributable to the privatization of its energy utilities over the last decade, which is bringing about a significant switch from coal to natural gas, the fossil fuel that produces the lowest level of carbon dioxide emissions per unit of energy consumed. To illustrate, the Energy Information Administration has estimated that natural gas as a percentage of total energy consumption will increase in the United Kingdom from 23 percent in 1990 to 35 percent in 2000. The United Kingdom has also increased its taxes on energy use, which it believes will also help to reduce greenhouse gas emissions. United Kingdom officials now estimate that carbon dioxide emissions in 2000 will be about 4 percent to 8 percent below 1990 emissions. The ability to assess countries' individual and relative efforts in reducing greenhouse gas emissions depends greatly on the countries' reporting of complete, reliable, and consistent emissions data. However, some of the national plans submitted by Annex I countries have not provided such data. Consequently, a complete assessment cannot be made of whether these countries will meet the Convention's goal of reducing all greenhouse gas emissions to 1990 levels by 2000. The recent adoption of revised reporting standards should improve the ability to assess progress against the current Convention goal. Negotiations are already under way aimed at reaching agreement on new, binding emissions targets past 2000 for these same countries. Reporting guidelines designed to help ensure that complete, reliable, and complete emissions data are provided by countries will also be an essential element of any new agreement. We recommend to the Secretary of State that, as part of ongoing international negotiations, the United States urge that reporting standards be formulated and adopted for any new targets beyond 2000 in order to enhance the completeness, reliability, and consistency of emissions data. We provided a draft of our report to the Department of State, the Council on Environmental Quality, the Department of Energy, and the Environmental Protection Agency for their review and comment. The Department of State commented that our report provides an accurate assessment of the progress of countries in reducing greenhouse gas emissions. The Department also agreed with our recommendation and noted that revisions had recently been made to the reporting guidelines that will lead to improved national plans. We updated our report to reflect that recent development. The Department also provided several additional comments, and we have revised the report as appropriate. (See app. IV for the Department of State's comments and our response.) The Council on Environmental Quality noted that our report provides a useful overview of the activities to date by the United States and other developed countries and agreed with our recommendation. The Council provided additional information to add context to our report. (See app. V for the Council's comments and our response.) The Department of Energy provided editorial comments on our report, which we incorporated as appropriate. The Environmental Protection Agency had no comments on our report. We conducted our audit work from September 1995 through July 1996 in accordance with generally accepted government auditing standards. A detailed discussion of our objectives, scope, and methodology is contained in appendix VI. As agreed with your office, unless you publicly announce its contents earlier, we plan no further distribution of this report until 15 days from the date of this letter. At that time, we will send copies to the Secretary of State; the Secretary of Energy; the Administrator, Environmental Protection Agency; the Director, Council on Environmental Quality; the Director, Office of Management and Budget; and other interested parties. We will also make copies available upon request. Please call me at (202) 512-6111 if you or your staff have any questions. Major contributors to this report are listed in appendix VII. The United Nations Framework Convention on Climate Change entered into force on March 21, 1994. As of June 1996, 159 countries had ratified the Convention. The Convention's ultimate objective is the "stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous interference with the climate system from human activities." To achieve this goal, the Convention established different types of goals and commitments for developed and developing countries. Under the Convention, all parties are to do the following: Prepare and communicate to the Conference of the Parties inventories of greenhouse gas emissions caused by human activity using comparable methodologies. Develop and communicate to the Conference of the Parties programs to mitigate the effects of greenhouse gases and measures the countries might take to adapt to climate change. Cooperate in the transfer of technology addressing greenhouse gas emissions in all relevant sectors of the economy. Promote sustainable management of greenhouse gas sinks and reservoirs. Cooperate in preparing for adaptation to the impacts of climate change. Integrate considerations of climate change with other policies. Conduct research to reduce the uncertainties about scientific knowledge of climate change, the effects of the phenomenon, and the effectiveness of responses to it. Exchange information on matters such as technology and the economic consequences of actions covered by the Convention. In addition to the above commitments, the Convention required developed countries and other parties included in Annex I of the Convention to do the following: Adopt national policies and take corresponding measures to mitigate climate change with the aim of returning human-induced emissions of greenhouse gases to 1990 levels by the year 2000 and by protecting and enhancing greenhouse gas sinks and reservoirs. Communicate, within 6 months of the Convention's entry into force and periodically thereafter, detailed information on policies and measures to limit greenhouse gas emissions, as well as on the resulting projections of greenhouse gas emissions and removals by sinks. Coordinate as appropriate with other parties the relevant economic and administrative instruments developed to achieve the objective of the Convention. Identify and periodically review policies and practices that encourage activities that lead to greater levels of human-induced emissions of greenhouse gases than would otherwise occur. The 36 Annex I countries are listed below. Of the Annex I countries, Belarus, Ukraine, and Turkey have not ratified the Convention. The European Economic Community--now known as the European Union--was also included as an Annex I party to the Convention. The countries listed in bold are those undergoing a transition to a market economy. The six countries we reviewed--Canada, Germany, Italy, Japan, the United Kingdom, and the United States--established various goals and employed varying approaches to attempt to meet their commitments under the Convention. This appendix describes the goals and plans to meet the goals for each of the six countries we reviewed. In 1990, Canada adopted a national goal to stabilize net emissions of all greenhouse gases by 2000 relative to 1990 emissions. Canada released its National Report on Climate Change to meet the goal. Canada's approach relies primarily on a set of voluntary measures aimed at increasing energy efficiency and conservation and encouraging a switch to less carbon dioxide-intensive energy sources. Because of Canada's high energy-intensity, most of its greenhouse gas emissions are generated by the demand for energy to heat and light homes and operate industries, as well as for other uses. Carbon dioxide emissions, generated chiefly from energy production and consumption, accounted for the majority of the 1990 actual emissions. Canada has acknowledged that it will miss its national goal if additional actions are not taken. It is not yet known how any additional initiatives will affect Canada's progress toward the climate change goal. Germany established an ambitious goal of reducing its emissions of carbon dioxide by 25 percent to 30 percent and its emissions of other greenhouse gases by 50 percent in 2005 relative to 1987 emissions levels. Germany has sought to achieve the goals by implementing a broad range of over 100 measures primarily aimed at reducing carbon dioxide emissions. Thus far, carbon dioxide emissions in Germany have decreased by about 16 percent from 1987 to 1994, primarily because of depressed economic conditions in the former East Germany. In addition to those reductions, several German industry associations have agreed to voluntarily decrease carbon dioxide emissions by up to 20 percent relative to 1990 levels in order to help Germany meet its own ambitious goal. However, recent reports suggest that Germany will not be able to meet its own ambitious goal, although it will most likely meet the Convention's goal by reducing greenhouse gas emissions below 1990 levels by 2000. The Italian government has noted that its national plan was the outgrowth of policies adopted for the Convention, but also designed to comply with prior decisions by the European Union to stabilize greenhouse gas emissions. The plan cites several initiatives already under way in the energy and transportation sectors but notes that an annual increase of between 0.4 percent and 0.9 percent in carbon dioxide emissions from energy consumption would still result. The plan also discusses possible additional initiatives that would help stabilize greenhouse gas emissions. These initiatives are primarily aimed at electricity generation, industrial production, the residential sector, and transport. Budgetary constraints and other factors, however, may impede the implementation of such measures. A recent estimate by the Italian Environment Ministry is that carbon dioxide emissions will increase by about 3 percent between 1990 and 2000. An official in that ministry stated that the government is still confident that it can meet the Convention's goal by enacting additional measures. Japan has established a goal of stabilizing its per capita emissions and total emissions of carbon dioxide at 1990 levels by 2000. To achieve the carbon dioxide target, in October 1990 Japan established an Action Program to Arrest Global Warming. In addition, Japan has pledged to undertake efforts to stabilize methane, nitrous oxide, and other greenhouse gas emissions, but has not specified a reference year. Japan estimates that it will not reach its goal of reducing total carbon dioxide emissions, if additional measures are not taken. Japan sought to reduce its emissions by building several nuclear power plants to help phase out the use of coal, but it has encountered difficulties in siting and building the plants. The United Kingdom has adopted the Convention's goal of stabilizing emissions of all greenhouse gases at 1990 levels in the year 2000. The United Kingdom establishes its strategy for meeting the goal in a January 1994 report, Climate Change, The UK Programme. The program relies essentially on a set of measures to reduce carbon dioxide emissions by improving energy efficiency. The United Kingdom also has adopted an 8-percent value added tax on residential fuel. The United Kingdom's program aims to return carbon dioxide emissions to 1990 levels by reducing emissions by 6 percent. The program also aims to reduce emissions of methane around 10 percent below 1990 levels, nitrous oxide by 75 percent, and emissions of other greenhouse gases from 25 percent to 90 percent. A United Kingdom official said that the country estimates it will meet its national target. In response to its commitment to the Climate Convention, the United States issued the Climate Change Action Plan (CCAP) in October 1993. The plan includes 44 initiatives designed to return net emissions of the major greenhouse gases--carbon dioxide, methane, nitrous oxides, and hydrofluorocarbons--to 1990 levels by 2000. The plan relies primarily on voluntary programs to reduce greenhouse gas emissions and enhance the capacity of greenhouse gas sinks to store carbon dioxide removed from the atmosphere. The U.S. plan aims to cut the net projected growth of 7 percent in the major greenhouse gas emissions between 1990 and 2000 in order to return emissions to 1990 levels by 2000. The United States estimates that it will likely fall short of its target without additional measures. Currently, the Council on Environmental Quality, the Department of Energy, the Department of State, and the Environmental Protection Agency are updating the plan by developing additional ways to achieve the Convention's goal. The new CCAP is scheduled to be issued in the fall of 1996. Changes in key economic factors and energy prices have made it more difficult for the United States to meet the goal of reducing greenhouse gas emissions to 1990 levels by 2000. Table III.1 shows changes in key growth factors between the 1993 Climate Change Action Plan (CCAP) and the Energy Information Administration's Annual Energy Outlook (AEO) 1996. Table III.2 compares projected fuel prices in 2000 in these two documents. CCAP (percent) AEO 1996 (percent) CCAP (in 1991 dollars) CCAP (converted to 1994 dollars) AEO 1996 (in 1994 dollars) World oil price (dollars per barrel) Wellhead natural gas (dollars per thousand cubic feet) Minemouth coal (dollars per ton) The following are GAO's comments on the Department of State's letter dated July 31, 1996. 1. We have revised our report to reflect the recent adoption of revised reporting guidelines for national plans to be submitted in conjunction with the Convention's current goal and the potential improvement they provide. 2. We continue to believe that a significant portion of the emissions data from national plans submitted thus far are incomplete, unreliable, or inconsistent. Therefore, as noted in the report, these data limit an assessment of countries' progress against the Convention's goal. We agree that estimates provided by other groups, such as the International Energy Agency, also provide some basis for determining progress, especially given that many Annex I countries will probably not come close to reaching the Convention's current goal. However, these other estimates are limited to carbon dioxide. Additionally, it is unclear how emissions data from these other groups will be considered by the Conference of the Parties in assessing progress against the current goal or any future binding targets. 3. We revised our report to note the formulation and adoption of improved guidelines from the Conference of the Parties in July 1996. We also noted that the original guidelines were adopted in April 1995, after the submission of many of the national plans. 4. We do not state in our report that progress will be assessed solely on the basis of the national plans but rather that the ability to assess countries' progress depends greatly on complete, reliable, and consistent data. We believe national plans will be a key component of that assessment and therefore improving the data in the plans is important. Additionally, as noted in comment 2, estimates from other groups apply only to carbon dioxide, and it is unclear how such estimates would be factored into assessing progress by the Conference of the Parties. 5. We revised our recommendation to note that reporting guidance could help enhance the completeness, reliability, and consistency of the reported emissions data rather than solve all the data problems. Also, despite broad agreement on methodologies for calculation of historical emissions, high levels of uncertainty still exist on reported emissions data other than carbon dioxide. The following are GAO's comments on the Council on Environmental Quality's letter dated July 31, 1996. 1. The Council on Environmental Quality notes that it is not surprising that differences exist in details reported by the countries, particularly for gases that constitute only a small fraction of greenhouse gases. However, we found that some of the problems with reported greenhouse gas emissions data, such as adjustments to 1990 emissions, also applied to carbon dioxide, the greenhouse gas reported to be the largest contributor to global warming. Additionally, emissions of greenhouse gases other than carbon dioxide--for which reported emissions data were incomplete in some cases and for which the reliability of the data was uncertain--constitute a significant enough portion of estimated total greenhouse gases to influence whether or not countries can meet the Convention's current goal or future binding targets. For example, these gases have been estimated to account for about 15 percent of the total U.S. greenhouse gas emissions in 1990 and that percentage is higher in many Annex I countries. 2. We have revised the report to note this recent development. The Ranking Minority Member of the House Committee on Commerce asked us to review the efforts of the United States and other Annex I countries toward returning greenhouse gas emissions to 1990 levels by 2000 as agreed under the 1992 United Nations Framework Convention on Climate Change. In addition, the requester asked that we determine the major factors that may impede the countries' progress in achieving the goal. We conducted our work from September 1995 through July 1996 in accordance with generally accepted government auditing standards. To determine the progress that the United States and other Annex I countries have made in reducing greenhouse gas emissions to 1990 levels, we obtained data on each country's greenhouse gas emissions for 1990 and projections for 2000--from the United Nations Secretariat on the Climate Change Convention and from other groups such as the Energy Information Administration and the International Energy Agency. We also reviewed other reports prepared by the Convention Secretariat that assessed the adequacy of the Convention's reporting guidelines and the national plans. We also discussed reporting issues with State Department and Convention officials. To determine the major factors that affect the countries' progress toward achieving the emissions target, we concentrated our efforts on Canada, Germany, Italy, Japan, the United Kingdom and the United States. We chose those six countries because they have been the largest emitters of carbon dioxide for developed countries. We obtained and reviewed the national plans of the six countries and spoke with representatives of each country to determine the major factors affecting their ability to reach the Convention's goal. We also discussed these factors with climate change experts and reviewed relevant reports from the Organization for Economic Cooperation and Development, the International Energy Agency, the Energy Information Administration, the Global Climate Coalition, and the United States Climate Action Network. William F. McGee, Assistant Director Robert D. Wurster, Senior Evaluator Mary A. Crenshaw, Senior Evaluator The first copy of each GAO report and testimony is free. Additional copies are $2 each. Orders should be sent to the following address, accompanied by a check or money order made out to the Superintendent of Documents, when necessary. VISA and MasterCard credit cards are accepted, also. Orders for 100 or more copies to be mailed to a single address are discounted 25 percent. 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Summary:
Pursuant to a congressional request, GAO evaluated the United States and other countries' progress in reducing greenhouse gas emissions to 1990 levels by year 2000. GAO found that: (1) incomplete, unreliable, and inconsistent data prevent a complete assessment of these countries' efforts to limit greenhouse gas emissions to 1990 levels by 2000; (2) the United Nations Framework Convention on Climate Change has compiled data emissions from 29 countries since February 1996; (3) all 29 countries reported 1990 data on carbon dioxide, 28 countries reported similar data for methane and nitrous oxide, and 8 countries did not provide projections to 2000 for at least one of the gases; (4) the level of uncertainty in emissions data is high since some countries adjusted their 1990 inventory levels to develop more reasonable projections for year 2000; (5) the Convention's reporting guidelines do not specify whether emissions' projections should be reported as gross emissions or net emissions; (6) this lack of detail affects the completeness and comparability of emissions inventories; (7) Germany and the United Kingdom are the only major developed countries that are likely to return to 1990 emissions levels by 2000; (8) energy use is the major factor affecting Annex I countries' ability to meet 1990 greenhouse levels by 2000; (9) efforts to reduce greenhouse gas emissions in the United States are hampered by changes in key economic variables; and (10) the adoption of revised reporting guidelines will help to ensure that complete and reliable emissions data are reported.