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Table 2.2-7 U.S. Greenhouse Gas Emissions and Sinks <br /> Gas/Source 2005 2012 2016 <br /> (MMT CO2e) (MMT CO2e) (MMT CO2e) <br /> CO2 6,132.0 5,366.7 5,310.9 <br /> Fossil Fuel Combustion 5476.9 5,024.4 4,966.0 <br /> Non-Energy Use of Fuels 138.9 108.0 112.2 <br /> Iron and Steel Production and Metallurgical Coke 68.2 55.6 42.3 <br /> Production <br /> Cement Manufacture 46.2 35.3 39.4 <br /> Natural Gas Systems 22.5 23.3 25.5 <br /> CH4 688.6 662.5 657.4 <br /> Enteric Fermentation 168.9 166.7 170.1 <br /> Landfills 132.7 117.0 107.7 <br /> Natural Gas Systems 169.1 159.6 163.5 <br /> Coal Mining 64.1 66.5 53.8 <br /> Manure Management 56.3 65.6 67.7 <br /> N20 357.8 335.8 369.5 <br /> Agricultural Soil Management 253.8 247.9 283.6 <br /> Mobile Combustion 38.8 24.3 18.4 <br /> Nitric Acid Production 11.3 10.5 10.2 <br /> Stationary Combustion 17.5 16.9 18.6 <br /> Manure Management 16.5 17.5 18.1 <br /> HFCs, PFCs,and SF6 141.5 163.1 172.8 <br /> Substitution of 03-Depleting Substances 102.7 144.8 159.1 <br /> HCFC-22 Production 20.0 5.5 2.8 <br /> Electrical Transmission and Distribution 8.3 4.7 4.3 <br /> Total Emissions 7,320.3 6,528.8 6,511.3 <br /> Land Use, Land-Use Change, and Forestry(Sink) (731.1) (753.5) (716.8) <br /> Net Emissions(Sources and Sinks) 6,589.1 5,775.3 5,794.5 <br /> Source: EPA(2018) https://www.epa.gov/sites/production/files/2018-01/documents/2018 complete report.odf. <br /> The subtotals represent only the highest contributing sources. <br /> Secondary GHGs do not have a direct atmospheric warming effect, but indirectly affect terrestrial <br /> radiation absorption by influencing the formation and destruction of tropospheric and stratospheric 03, <br /> or in the case of S02,the absorptive characteristics of the atmosphere. <br /> Additionally, some of these gases may react with other chemical compounds in the atmosphere to form <br /> compounds that are GHGs.Table 2.2-8 provides national emissions of S02 for years 2005, 2012,and 2016. <br /> Levels of S02 emissions have decreased since 2005 due to reductions in electricity generation, but <br /> Dunn Ranch Area LBA and Mining Plan Modification 14 <br /> Technical Resources Report <br />