Abstract
The Air and Energy Engineering Research Laboratory (AEERL) of EPA's Office of Research and Development has chosen anthropogenic methane emissions as a principal focus in its global climate research program. Three of the major sources are municipal solid waste landfills, coal mines, and natural gas systems. This paper presents the scope and methodology of the AEERL methane emission studies and discloses data accumulated thus far in the program. A major emphasis in the landfill program is measurement of emissions from operating landfills and calculation of country-specific emissions. Landfill methane emissions are not estimated, but factors affecting emissions are discussed and estimates developed by others are provided. For coal mines, existing data collected by other researchers on underground mines are combined with EPA data on emissions from surface mines to provide an estimate of global emissions of 43 Tg/yr. Methane from natural gas production, transmission, and distribution systems is estimated to be 4.4 Tg/yr for the United States.
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