Notes: 2006 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 State, appendix E, available at http://www.eia.doe.gov/oiaf/1605/gg02rpt/appendixes.html, as of December 2005. 1990-2006-USDOE, EIA, U.S. Carbon Dioxide from Energy Sources 2007 Flash Estimate, available at http://www.eia.doe.gov/oiaf/1605/flash/flash.html as of September 2007.