TRANSPORTATION ENERGY DATA BOOK: EDITION 20 - Center for ...

Table 3.4
Estimated U.S. Emissions of Greenhouse Gases, 1990-98
Greenhouse gas Unit of measurea 1990 1991 1992 1993 1994 1995 1996 1997 1998
Carbon dioxide million metric tons of gas 4,939.0 4,886.0 4,972.9 5,109.5 5,169.7
million metric tons of carbon 1,347.0 1,333.O. 1,356.0 1,389.0 1,410.o
Methane million metric tons of gas 30.2 30.5 30.6 29.9 30.0
million metric tons of carbon (gwp)” 173.0 174.0 175.0 171.0 172.0
Nitrous oxide million metric tons of gas
million metric tons of carbon (gwp)b
Carbon monoxide million metric tons of gas
Nitrogen oxide million metric tons of gas
Nonmethane VOCsd million metric tons of gas
CFC-11,12,113d million metric tons of gas
HCFC-22d million metric tons of gas
HCFC-23 ana PFCsd million metric tons of carbon (gwp)”
1.2 1.2
99.0 101.0
86.8 88.6
21.2 21.3
18.9 19.0
0.2 0.2
0.1 0.1
22.0 22.0
1.2 1.2 1.3
103.0 103.0 111.0
85.5 85.6 89.5
21.6 21.8 22.1
18.6 18.8 19.4
0.1 0.1 0.1
0.1 0.1 0.1
23.0 24.0 26.0
5,220.5 5,395.6 5,464.g
1,424.0 1,472.0 1,490.o
30.2 29.3 29.3
173.0 168.0 168.0
1.3 1.2 1.2
106.0 105.0 104.0
80.7 82.3 79.2
21.5 21.3 21.4
18.6 17.4 17.3
0.1 0.1 0.0
0.1 0.1 0.1
32.0 36.0 38.0
Source:
U.S. Department of Energy, Energy Information Administration, Emissions of Greenhouse Gases in the United States, 1998, Washington, DC, October
1999, p. ix, x. (Additional resources: www.eia.doe.gov)
Criteria pollutants (CO, NO,, VOC) -U.S. Environmental Protection Agency, NationaZAiu Pollutant Emission Trends, 1900-1997, 1998, pp. A-6, A-l 1,
A- 18. (Additional resources: www.epa.govloarloaqps)
aGases that contain carbon can be measured either in terms of the full molecular weight of the gas or just in terms of their carbon content. See
Appendix B, Table B.5 for details.
bBased on global warming potential.
‘Data are not available.
dVOC=volatile organic compounds. CFC=chlorofluorocarbons. HCFC=hydrochlorofluorocarbons. HFC=hydrofluorocarbons.
PFC=perfluorocarbons.
5,483.4
1,495.0
28.8
165.0
1.2
103.0
c
c
c
0.0
0.1
40.0