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Fluorinated gases are typically emitted in smaller quantities than other greenhouse gases, but they are potent greenhouse gases. Fluorinated gases (especially hydrofluorocarbons) are sometimes used as substitutes for stratospheric ozone-depleting substances (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). Nitrous oxide (N 2O): Nitrous oxide is emitted during agricultural, land use, and industrial activities combustion of fossil fuels and solid waste as well as during treatment of wastewater.įluorinated gases: Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of household, commercial, and industrial applications and processes.Methane emissions also result from livestock and other agricultural practices, land use and by the decay of organic waste in municipal solid waste landfills. Methane (CH 4): Methane is emitted during the production and transport of coal, natural gas, and oil.Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle. Carbon dioxide (CO 2): Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement).For more information on the other climate forcers, such as black carbon, please visit the Climate Change Indicators: Climate Forcing page.
This section provides information on emissions and removals of the main greenhouse gases to and from the atmosphere. Gases that trap heat in the atmosphere are called greenhouse gases. Percentages may not add up to 100% due to independent rounding. Emissions in 2020 = 5,981 Million Metric Tons of CO2 equivalent (excludes land sector).