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(詳細はUnited States was the largest emitter of carbon dioxide emissions. In 2006, China overtook the US. the Department of Energy projected United States' greenhouse gas (GHG) emissions from the US energy industry to drop 28 percent from its 2007 value by 2030, due to the recession and the hydraulic fracturing boom in natural gas which reduced the release of carbon dioxide into the Earth's atmosphere.〔(americas-shrinking-greenhouse-gas-emissions ) 2012-04-19 Businessweek〕 While the Bush administration opted against Kyoto-type policies, the Obama administration and various state, local, and regional governments have attempted to adopt some Kyoto Protocol goals on a local basis. For example, the Regional Greenhouse Gas Initiative (RGGI) founded in January 2007 is a state-level emissions capping and trading program by nine northeastern U.S. states. In December 2009 President Obama set a target for reducing U.S. greenhouse gas (GHG) emissions in the range of 17% below 2005 levels by 2020.〔http://apps1.eere.energy.gov/news/news_detail.cfm/news_id=15650 December 02, 2009 President Obama Sets a Target for Cutting U.S. Greenhouse Gas Emissions〕 The U.S. State Department offered a nation-level perspective in the Fourth US Climate Action Report (USCAR) to the United Nations Framework Convention on Climate Change, including measures to address climate change. The report showed that the country was on track to achieve President Bush's goal of reducing greenhouse gas emissions per unit of gross domestic product) by 18 percent from 2002 to 2012. Over that same period, actual GHG emissions were projected to increase by 11 percent. The report estimated that in 2006, U.S. GHG emissions decreased 1.5 percent from 2005 to 7,075.6 million tonnes of carbon dioxide equivalent. This was an increase of 15.1 percent from the 1990 levels of 6,146.7 million tonnes (or 0.9 percent annual increase), and an increase of 1.4 percent from the 2000 levels of 6,978.4 million tonnes. By 2012 GHG emissions were projected to increase to more than 7,709 million tonnes of carbon dioxide equivalent, which would be 26 percent above 1990 levels. == 2007 == U.S. carbon dioxide emissions from energy use rose by 1.6% in 2007, according to preliminary estimates by the United States Department of Energy's Energy Information Administration (EIA). Electricity generation increased by 2.5%, and carbon dioxide emissions from the power sector increased even more, at 3%, indicating that U.S. utilities shifted towards energy sources that emitted more carbon. That shift was partially caused by a 40 billion kilowatt-hour decrease in hydropower production causing a greater reliance on fossil fuels like natural gas and coal. Carbon dioxide emissions from power plants fueled with natural gas increased by 10.5%, while coal-burning power plants increased their emissions by 1.8%.〔(EIA - Emissions of Greenhouse Gases in the U.S. 2006-Carbon Dioxide Emissions )〕 In 2007 the National Oceanic and Atmospheric Administration stated that the "U.S. and global annual temperatures are now approximately 1.0°F warmer than at the start of the 20th century, and the rate of warming has accelerated over the past 30 years, increasing globally since the mid-1970's at a rate approximately three times faster than the century-scale trend. The past nine years have all been among the 25 warmest years on record for the contiguous U.S., a streak which is unprecedented in the historical record."〔(The Global Warming Debate - The Facts )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Greenhouse gas emissions by the United States」の詳細全文を読む スポンサード リンク
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