Million metric tons of carbon
Notes: One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed
1990–2002 data are revised from previous editions. 2003 data are preliminary.
Sources: 1980–1989—U.S. Department of Energy (USDOE), Energy Information
Administration (EIA), Appendix E, available at http://www.eia.doe.gov/oiaf/1605/ggrpt/index.html, as of
1990–2003—USDOE, EIA, U.S. Carbon Dioxide from Energy Sources 2003 Flash Estimate, available at http://www.eia.doe.gov/oiaf/1605/flash/flash.html, as of June 2004.