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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.