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Transportation energy data book: edition 23 - Oak Ridge National ...

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11–4<br />

Carbon dioxide emissions in 2001 were 16% higher than in 1990. Carbon dioxide accounts for the<br />

majority of greenhouse gases.<br />

Table 11.3<br />

Estimated U.S. Emissions of Greenhouse Gases, 1990–2001<br />

Greenhouse gas Unit of measure a 1990 1995 2000 2001<br />

Carbon dioxide million metric tons of gas 5,002.8 5,320.9 5,855.1 5,788.5<br />

million metric tons of carbon 1,364.0 1,451.0 1,597.0 1,579.0<br />

Methane million metric tons of gas 31.7 31.1 28.3 28.0<br />

million metric tons of carbon (gwp) b 199.0 195.0 178.0 176.0<br />

Nitrous oxide million metric tons of gas 1.2 1.3 1.2 1.2<br />

million metric tons of carbon (gwp) b 94.0 102.0 98.0 97.0<br />

c b HFCs, PFCs, and SF6 million metric tons of carbon (gwp) 25.0 27.0 34.0 31.0<br />

Source:<br />

U.S. Department of Energy, Energy Information Administration, Emissions of Greenhouse Gases in the<br />

United States, 2001, Washington, DC, December 2002, Tables ES1 andES2.<br />

(Additional resources: www.eia.doe.gov)<br />

a Gases that contain carbon can be measured either in terms of the full molecular weight of the gas or just in<br />

terms of their carbon content. See Appendix B, Table B.5 for details.<br />

b Based on global warming potential.<br />

c HFC-hydrofluorocarbons. PFC-perfluorocarbons. SF6-sulfur hexaflouride.<br />

TRANSPORTATION ENERGY DATA BOOK: EDITION <strong>23</strong>—2003

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