Key: TgCO2 Eq. = teragrams of carbon dioxide equivalent. A teragram = 1 million metric tons.
Note: Electric power sector emissions are distributed across sectors. Emissions include CO2, CH4, N2O, HFCs, PFCs, and SF6.
Source: U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011, available at www.epa.gov/climatechange/ghgemissions/usinventoryreport.html as of August 2013.