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. Emissions coefficients from 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. 4.89-4.107, web site www.iea.org/ipcc/invs6.htm. Total nitrogen content of U.S. commercial fertilizer consumption--1988-1994, Tennessee Valley Authority; 1995-1998, Association of American Plant Food Control Officials, Commercial Fertilizers (Washington, DC, various years). Manure application based on cattle population data provided by the U.S. Department of Agriculture, National Agricultural Statistics Service, Livestock, Dairy and Poultry Service. Typical animal sizes from U.S. Environmental Protection Agency, Office of Air and Radiation, Anthropogenic Methane Emissions in the United States: Estimates for 1990 (Washington, DC, April 1993). Manure production and waste management systems used from L.M. Safley, M.E. Casada et al., Global Methane Emissions From Livestock and Poultry Manure (Washington, DC, February 1992), and U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-1994 (Washington, DC, November 1995).