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[[File:Perfluorotributylamine-global-warming-potential.jpg|thumb|Comparison of global warming potential (GWP) of three [[greenhouse gas]]es over a 100-year period: [[Perfluorotributylamine]], [[nitrous oxide]], [[methane]] and [[carbon dioxide]] (the latter is the reference value, therefore it has a GWP of one)]] |
[[File:Perfluorotributylamine-global-warming-potential.jpg|thumb|Comparison of global warming potential (GWP) of three [[greenhouse gas]]es over a 100-year period: [[Perfluorotributylamine]], [[nitrous oxide]], [[methane]] and [[carbon dioxide]] (the latter is the reference value, therefore it has a GWP of one)]] |
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'''Global |
'''Global Warming Potential''' ('''GWP''') is an index to measure how much [[infrared]] [[thermal radiation]] a [[greenhouse gas]] would absorb over a given time frame after it has been added to the [[atmosphere]] (or ''emitted'' to the atmosphere). The GWP makes different greenhouse gases comparable with regard to their "effectiveness in causing [[radiative forcing]]".<ref name=":2" />{{Rp|page=2232}} It is expressed as a multiple of the radiation that would be absorbed by the same [[mass]] of added [[carbon dioxide]] ({{CO2}}), which is taken as a reference gas. Therefore, the GWP has a value of 1 for {{CO2}}. For other [[gas]]es it depends on how strongly the gas absorbs infrared thermal radiation, how quickly the gas leaves the atmosphere, and the time frame being considered. |
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For example, [[Methane emissions|methane]] has a GWP over 20 years (GWP-20) of 81.2<ref name=":0">{{Citation |title=7.SM.6 Tables of greenhouse gas lifetimes, radiative efficiencies and metrics |date=2021 |url=https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter_07_Supplementary_Material.pdf |page=7SM-24 |publisher=[[IPCC]]}}.</ref> meaning that, for example, a [[Fugitive gas emissions|leak]] of a tonne of methane is equivalent to emitting 81.2 tonnes of carbon dioxide measured over 20 years. As methane has a much shorter atmospheric lifetime than carbon dioxide, its GWP is much less over longer time periods, with a GWP-100 of 27.9 and a GWP-500 of 7.95.<ref name=":0" />{{Rp|page=7SM-24}} |
For example, [[Methane emissions|methane]] has a GWP over 20 years (GWP-20) of 81.2<ref name=":0">{{Citation |title=7.SM.6 Tables of greenhouse gas lifetimes, radiative efficiencies and metrics |date=2021 |url=https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter_07_Supplementary_Material.pdf |page=7SM-24 |publisher=[[IPCC]]}}.</ref> meaning that, for example, a [[Fugitive gas emissions|leak]] of a tonne of methane is equivalent to emitting 81.2 tonnes of carbon dioxide measured over 20 years. As methane has a much shorter atmospheric lifetime than carbon dioxide, its GWP is much less over longer time periods, with a GWP-100 of 27.9 and a GWP-500 of 7.95.<ref name=":0" />{{Rp|page=7SM-24}} |
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