5
Greenhou se Methane Yao Yao & Mason Edwards
Greenhouse Methane
Yao Yao & Mason Edwards
Natural Gas and Petroleum SystemsEnteric FermentationLandfillsMining operationsWastewater
Anthropogenic Sources
Wikipedia, 2011
Natural Sources & Sinks
PermafrostWetlandsTermitesForests/FiresGas Hydrates
Chlorine IonsHydroxyl
Wikipedia, 2011
Wetlands
Permafrost
Hydrates
Termites
Forests/Fires
Methane Through Time
1850 1870 1890 1910 1930 1950 1970 19900
10
20
30
40
50
60
Natural GasCoal MiningBiomass BurningLivestockRice & Wet CropsLandfills
Year
Tg of CH4
Source Category (TgCO2 Eq.) 1990 2000 2005 2006 2007 2008 2009
Natural Gas Systems 190 209 190 218 205 212 221
Enteric Fermentation 132 137 137 139 141 141 140
Landfills 147 112 113 112 111 116 118
Coal Mining 84 60 57 58 58 67 71
Manure Management 32 42 47 47 51 49 50
Petroleum Systems 35 32 29 29 30 30 31
Wastewater Treatment 24 25 24 25 24 25 25
Forest Land 3 14 10 22 20 12 8
Rice Cultivation 7 8 7 6 6 7 7
Total for U.S. 675 660 631 672 665 677 686
Modern Trends
EPA, 2010
