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What are the different GHGs emitted by human activity that contribute to total greenhouse gas emissions?
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Global greenhouse gases emitted by human activities are given below.

GasChemical Formula% contribution to global greenhouse gas emissionsSourcesGlobal Warming Potential (GWP100)*Length of stay in the atmosphere
Carbon DioxideCO276Burning fossil fuels & wood, deforestation, land clearing for agriculture1Some is absorbed quickly (for example, by the ocean surface), but some will remain in the atmosphere for thousands of years
MethaneCH416Production and transport of some fossil fuels, agricultural activities, waste management, energy use, biomass burning21-28About a decade
Nitrous OxideN2O6Fertiliser use, fossil fuel combustion, industrial activities265-310More than a century
Fluorinated gases or F-gasesGroup of gases that contain fluorine, including hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6)2Industrial processes, refrigeration, a variety of consumer products. Sometimes used as substitutes for ozone-depleting substances such as chlorofluorocarbons (CFCs).Hundreds to thousands depending on the exact gasCenturies

(*) IPCC keeps updating GWP values with each of its scientific assessment reports as its scientific understanding improves. See “What Is Global Warming Potential?” (OneSharedEarth, 2020) for more.



Global Greenhouse Gas Emissions Data” (US Environmental Protection Agency, 2016)

Climate Change Indicators: Greenhouse Gases” (US Environmental Protection Agency, 2017)

Understanding Global Warming Potentials” (US Environmental Protection Agency, 2019)

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