Table 22. Estimated U.S. Emissions of Nitrous Oxide, 1990-1998
(Thousand Metric Tons of Nitrous Oxide)

Source 1990 1991 1992 1993 1994 1995 1996 1997 P1998
Agriculture  
  Nitrogen Fertilization of Soils 614 620 638 621 686 616 607 628 637
  Crop Residue Burning 1 1 2 1 2 1 2 2 2
  Solid Waste of Domesticated Animals 229 231 234 238 241 243 239 235 233
     Total 844 853 873 860 929 860 847 865 872
Energy Use  
  Mobile Sources 166 176 186 195 209 222 217 220 222
  Stationary Combustion 44 44 44 45 46 46 48 48 49
    Total 210 220 231 240 255 268 265 269 271
Waste Management  
  Waste Combustion 1 1 1 1 1 1 1 1 1
  Human Sewage in Wastewater 16 16 16 16 17 17 17 17 18
    Total 17 17 17 17 18 18 18 18 18
Industrial Sources 96 99 95 100 110 111 115 73 58
Total 1,167 1,189 1,217 1,218 1,312 1,257 1,245 1,225 1,220

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: 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. 4.81-4.94, 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. Emissions from human sewage--Food and Agriculture Organization of the United Nations, web site, apps.fao.org/lim500/nph-wrap.pl; 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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