| Gas | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 |
| million metric tons of carbon or carbon equivalent | |||||||||
| Carbon dioxide | 1,347 | 1,333 | 1,356 | 1,389 | 1,410 | 1,424 | 1,472 | 1,490 | 1,495 |
| Methane | 173 | 174 | 175 | 171 | 172 | 173 | 168 | 168 | 165 |
| Nitrous oxide | 99 | 101 | 103 | 103 | 111 | 106 | 105 | 104 | 103 |
| HFCs, PFCs and SF6 | 22 | 22 | 23 | 24 | 26 | 32 | 36 | 38 | 40 |
| Total | 1,641 | 1,629 | 1,657 | 1,685 | 1,719 | 1,735 | 1,780 | 1,800 | 1,803 |
Source: U.S. Department of Energy, Energy Information Administration, Emissions of Greenhouse Gases in the United States, 1998, DOE/EIA-0573(99) (GPO, Washington, DC, 1999).
Notes: HFCs = Hydrofluorocarbons. PFCs = Perfluorocarbons. SF6 = Sulfur hexafluoridene. Emissions include direct and indirect effects. Data for 1998 are preliminary. Data in this table are revised from the data in the previous EIA report, Emissions of Greenhouse Gases in the United States, 1997, DOE/EIA-0573(98) (GPO, Washington, DC, 1998).
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