## 3.4 : Commercial Environmental Emissions

 3.4.6 2009 Methane Emissions for U.S. Commercial Buildings Energy Production, by Fuel Type (1) Fuel Type MMT CO2 Equivalent Petroleum 0.5 Natural Gas 26.8 Coal 0.3 Wood 0.4 Electricity (2) 50.5 Total 78.5 Note(s): 1) Sources of emissions include oil and gas production, processing, and distribution; coal mining; and utility and site combustion. Carbon Dioxide equivalent units are calculated by converting methane emissions to carbon dioxide emissions (methane's global warming potential is 23 times that of carbon dioxide). 2) Refers to emissions of electricity generators attributable to the buildings sector.