Gas/Source 1990 2005 2018 2019 2020 2021 2022 CO 2 4,910.9 5,923.1 5,190.6 5,059.1 4,520.2 4,840.7 4,875.5 Fossil Fuel Combustion 4,752.2 5,744.1 4,988.2 4,852.6 4,341.7 4,654.3 4,699.4 Transportation 1,468.9 1,858.6 1,813.1 1,816.6 1,572.8 1,753.5 1,751.3 Electricity Generation 1,820.0 2,400.1 1,753.4 1,606.7 1,439.6 1,540.9 1,531.7 Industrial 876.5 847.6 810.5 809.8 762.0 780.5 801.1住宅338.6 358.9 338.9 338.9 342.9 314.8 314.8 318.0 334.1商业228.3 227.1 246.3 246.3 251.7 251.7 229.3 237.3 237.3 237.5 258.7 U.S.Territories 20.0 51.9 25.9 24.8 23.3 23.8 22.6 Non-Energy Use of Fuels 99.1 125.0 118.4 106.5 97.8 111.6 102.8 Natural Gas Systems 32.4 26.3 32.8 38.5 36.7 35.8 36.5 Petroleum Systems 9.6 10.2 34.8 45.5 28.9 24.1 22.0 Incineration of Waste 12.9 13.3 13.3 12.9 12.9 12.5 12.4 Coal Mining 4.6 4.2 3.1 3.0 2.2 2.5 2.5 Abandoned Oil and Gas Wells + + + + + + + Biomass-Wood a 215.2 206.9 220.0 217.7 190.6 192.5 195.3 International Bunker Fuels b 103.6 113.3 124.3 113.6 69.6 80.2 98.2生物燃料 - 乙醇A 4.2 22.9 81.9 82.6 71.8 79.1 79.6