Table 13. U.S. Methane Emissions from Anthropogenic Sources, 1990-1998
(Million Metric Tons of Methane)

Source 1990 1991 1992 1993 1994 1995 1996 1997 P1998
Energy Sources  
  Coal Mining 4.26 4.12 3.97 3.34 3.36 3.43 2.95 3.16 3.15
  Oil and Gas 5.70 5.92 5.99 5.97 5.99 6.08 6.10 6.25 6.27
  Stationary Combustion 0.56 0.59 0.62 0.54 0.53 0.58 0.58 0.44 0.43
  Mobile Sources 0.25 0.23 0.24 0.24 0.24 0.25 0.24 0.24 0.24
    Total Energy Sources 10.77 10.86 10.82 10.10 10.11 10.34 9.87 10.09 10.09
Waste Management  
  Landfills 10.97 10.94 10.90 10.86 10.74 10.69 10.54 10.20 9.70
  Wastewater Treatment 0.15 0.15 0.15 0.16 0.16 0.16 0.16 0.16 0.16
    Total Waste Management 11.12 11.09 11.05 11.01 10.90 10.85 10.70 10.36 9.87
Agricultural Sources  
  Enteric Fermentation 5.17 5.30 5.39 5.47 5.62 5.62 5.47 5.42 5.41
  Animal Waste 2.57 2.67 2.69 2.71 2.77 2.78 2.68 2.79 2.83
  Rice Paddies 0.40 0.39 0.44 0.40 0.47 0.44 0.40 0.44 0.47
  Crop Residue Burning 0.04 0.04 0.04 0.03 0.04 0.03 0.04 0.04 0.04
    Total Agricultural Sources 8.18 8.40 8.56 8.62 8.91 8.87 8.60 8.69 8.74
Industrial Processes 0.12 0.11 0.12 0.12 0.13 0.13 0.13 0.13 0.13
Total 30.19 30.47 30.55 29.85 30.05 30.20 29.30 29.27 28.84

P = preliminary data.
Notes: Data in this table are revised from the data contained in the previous EIA report, Emissions of Greenhouse Gases in the United States 1997, DOE/EIA-0573(97) (Washington, DC, October 1998). Totals may not equal sum of components due to independent rounding.
Sources: EIA estimates presented in this chapter. Crop residue burning--U.S. Department of Agriculture, National Agricultural Statistics Service, Crop Production (annual reports). Emissions calculations based on Intergovernmental Panel on Climate Change, Greenhouse Gas Inventory Reference Manual: Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories, Vol. 3 (Paris, France, 1997), pp. 4.83-4.84, web site www.iea.org/ipcc/invs6.htm; and U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-1997, EPA-236-R-99-003 (Washington, DC, April 1999), web site www.epa.gov/globalwarming/inventory/1999-inv.html.

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