Key: R = Revised.
Notes: 2007 data are preliminary. One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed across sectors.
Sources: 1985–1989—U.S. Department of Energy (USDOE), Energy Information Administration (EIA), Emissions of Greenhouse Gasses in the United States, appendix E, available at http://www.eia.doe.gov/oiaf/1605/1605aold.html, as of December 2005. 1990–2007—USDOE, EIA, U.S. Carbon Dioxide from Energy Sources 2008 Flash Estimate, available at http://www.eia.doe.gov/oiaf/1605/flash/flash.html as of October 2008.