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Understanding, quantifying, and tracking atmospheric methane and emissions is essential for addressing concerns and informing decisions that affect the climate, economy, and human health and safety. Atmospheric methane is a potent greenhouse gas (GHG) that contributes to global warming. While carbon dioxide is by far the dominant cause of the rise in global average temperatures, methane also plays a significant role because it absorbs more energy per unit mass than carbon dioxide does, giving it a disproportionately large effect on global radiative forcing. In addition to contributing to climate change, methane also affects human health as a precursor to ozone pollution in the lower atmosphere. Improving Characterization of Anthropogenic Methane Emissions in the United States summarizes the current state of understanding of methane emissions sources and the measurement approaches and evaluates opportunities for methodological and inventory development improvements. This report will inform future research agendas of various U.S. agencies, including NOAA, the EPA, the DOE, NASA, the U.S. Department of Agriculture (USDA), and the National Science Foundation (NSF).
The GHG Protocol Corporate Accounting and Reporting Standard helps companies and other organizations to identify, calculate, and report GHG emissions. It is designed to set the standard for accurate, complete, consistent, relevant and transparent accounting and reporting of GHG emissions.
The world's nations are moving toward agreements that will bind us together in an effort to limit future greenhouse gas emissions. With such agreements will come the need for all nations to make accurate estimates of greenhouse gas emissions and to monitor changes over time. In this context, the present book focuses on the greenhouse gases that result from human activities, have long lifetimes in the atmosphere and thus will change global climate for decades to millennia or more, and are currently included in international agreements. The book devotes considerably more space to CO2 than to the other gases because CO2 is the largest single contributor to global climate change and is thus the focus of many mitigation efforts. Only data in the public domain were considered because public access and transparency are necessary to build trust in a climate treaty. The book concludes that each country could estimate fossil-fuel CO2 emissions accurately enough to support monitoring of a climate treaty. However, current methods are not sufficiently accurate to check these self-reported estimates against independent data or to estimate other greenhouse gas emissions. Strategic investments would, within 5 years, improve reporting of emissions by countries and yield a useful capability for independent verification of greenhouse gas emissions reported by countries.
The United States economy has continued to expand at a solid pace and price pressures have eased somewhat. However, a sustained fiscal deficit has contributed to raising public debt as a share of GDP to its highest level since World War II, with a further substantial increase in prospect over coming decades as the population ages. To put the public finances on a more sustainable path, a multi-year fiscal adjustment should be enacted that achieves savings on pensions and healthcare and raises taxation, including on capital incomes. A more medium-term oriented and less complicated federal budgeting process would support this. At the same time, economic growth would benefit from productivity enhancing reforms that promote competition, including through maintaining international trade openness and reinforcing relevant skills in the workforce. Efforts to reduce greenhouse gas emissions have accelerated, but further policy measures will be needed to achieve emission reduction targets. Policy options include a package of broad-based carbon pricing, taxes and sectoral policies. As the climate transition further progresses, additional measures will be needed to support displaced workers from fossil fuel industries and for climate adaptation. SPECIAL FEATURE: MANAGING FISCAL PRESSURES IN THE UNITED STATES