Gas

1990

1991

1992

1993

1994

1995

1996

1997

1998

P1999

Carbon Dioxide

1,351

1,338

1,365

1,397

1,422

1,435

1,484

1,505

1,507

1,527

Methane

182

183

183

178

179

179

173

172

168

165

Nitrous Oxide

99

101

103

103

111

106

105

104

103

103

HFCs, PFCs, and SF₆

24

22

24

24

25

29

33

35

40

38

  Total

1,655

1,644

1,675

1,702

1,737

1,748

1,796

1,816

1,818

1,833

P = preliminary data.
Note: Data in this table are revised from the data contained in the previous EIA report, Emissions of Greenhouse Gases in the United States 1998, DOE/EIA-0573(98) (Washington, DC, October 1999).
Sources: Emissions: Estimates presented in this report. Global Warming Potentials: Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996).