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Methane * This change can be due to updated scientific estimates of the energy absorption or lifetime of the gases or to changing atmospheric concentrations of GHGs that result in a change in the energy absorption of 1 additional ton of a gas relative to another.In the most recent report by the Intergovernmental Panel on Climate Change (IPCC), multiple methods of calculating GWPs were presented based on how to account for the influence of future warming on the carbon cycle. Species. While the GWP is a measure of the heat absorbed over a given time period due to emissions of a gas, the GTP is a measure of the temperature change at the end of that time period (again, relative to CO 51 0 obj <>/Filter/FlateDecode/ID[<0FF8D42EEC8C2D0D58A17423798E64EE><8C361BE6BC3C7847A3476835593E1272>]/Index[34 31]/Info 33 0 R/Length 86/Prev 80488/Root 35 0 R/Size 65/Type/XRef/W[1 2 1]>>stream
CO 2. variable § 1. �:Ō��pQt)N���i��1�\��i�p��}¾�=�㧴�p%@�8���a��7~��r�.w��=_6�,�m��s�F��˜U�h�vqn����g8���s?__�b�h5���GǎD��e>o@��/.��q�p��9�VO��2_��Y?_Ouqu��K0
Because all GWPs are calculated relative to COAnother alternate metric is the Global Temperature Potential (GTP). %%EOF These gases differ in their ability to absorb energy, that is, they have various radiative efficiencies. 1. �j 6nW H0 ! Different GHGs can have different effects on the Earth's warming. This 20-year GWP prioritizes gases with shorter lifetimes, because it does not consider impacts that happen more than 20 years after the emissions occur.
64 0 obj <>stream Greenhouse gases warm the earth by absorbing energy and decreasing the rate at which the energy escapes the atmosphere. An official website of the United States government.Greenhouse gases (GHGs) warm the Earth by absorbing energy and slowing the rate at which the energy escapes to space; they act like a blanket insulating the Earth. Two key ways in which these gases differ from each other are their ability to absorb energy (their "radiative efficiency"), and how long they stay in the atmosphere (also known as their "lifetime").The Global Warming Potential (GWP) was developed to allow comparisons of the global warming impacts of different gases. Just like the 100-year GWP is based on the energy absorbed by a gas over 100 years, the 20-year GWP is based on the energy absorbed over 20 years. h�b```f``�f`a`.c�g@ ~�r`9�����=Z�vP\h�=�s����":`*��|��`�`�"�s���l�7�,�w(��C3U�i�����[��1j�iF ����h��3� ~�� Specifically, it is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period of time, relative to the emissions of 1 ton of carbon dioxide (COEPA and other organizations will update the GWP values they use occasionally.
The Reporting Program collects data about some industrial gases that do not have GWPs listed in the AR4; for these gases, the Reporting Program uses GWP values from other sources, such as the Fifth Assessment Report.The United States primarily uses the 100-year GWP as a measure of the relative impact of different GHGs.
100 years. 500 years. In science communications, the EPA will refer to the most recent GWPs. For this Web page, we are presenting the range of the lowest to the highest values listed by the IPCC.The EPA considers the GWP estimates presented in the most recent IPCC scientific assessment to reflect the state of the science.
Methane * This change can be due to updated scientific estimates of the energy absorption or lifetime of the gases or to changing atmospheric concentrations of GHGs that result in a change in the energy absorption of 1 additional ton of a gas relative to another.In the most recent report by the Intergovernmental Panel on Climate Change (IPCC), multiple methods of calculating GWPs were presented based on how to account for the influence of future warming on the carbon cycle. Species. While the GWP is a measure of the heat absorbed over a given time period due to emissions of a gas, the GTP is a measure of the temperature change at the end of that time period (again, relative to CO 51 0 obj <>/Filter/FlateDecode/ID[<0FF8D42EEC8C2D0D58A17423798E64EE><8C361BE6BC3C7847A3476835593E1272>]/Index[34 31]/Info 33 0 R/Length 86/Prev 80488/Root 35 0 R/Size 65/Type/XRef/W[1 2 1]>>stream
CO 2. variable § 1. �:Ō��pQt)N���i��1�\��i�p��}¾�=�㧴�p%@�8���a��7~��r�.w��=_6�,�m��s�F��˜U�h�vqn����g8���s?__�b�h5���GǎD��e>o@��/.��q�p��9�VO��2_��Y?_Ouqu��K0
Because all GWPs are calculated relative to COAnother alternate metric is the Global Temperature Potential (GTP). %%EOF These gases differ in their ability to absorb energy, that is, they have various radiative efficiencies. 1. �j 6nW H0 ! Different GHGs can have different effects on the Earth's warming. This 20-year GWP prioritizes gases with shorter lifetimes, because it does not consider impacts that happen more than 20 years after the emissions occur.
64 0 obj <>stream Greenhouse gases warm the earth by absorbing energy and decreasing the rate at which the energy escapes the atmosphere. An official website of the United States government.Greenhouse gases (GHGs) warm the Earth by absorbing energy and slowing the rate at which the energy escapes to space; they act like a blanket insulating the Earth. Two key ways in which these gases differ from each other are their ability to absorb energy (their "radiative efficiency"), and how long they stay in the atmosphere (also known as their "lifetime").The Global Warming Potential (GWP) was developed to allow comparisons of the global warming impacts of different gases. Just like the 100-year GWP is based on the energy absorbed by a gas over 100 years, the 20-year GWP is based on the energy absorbed over 20 years. h�b```f``�f`a`.c�g@ ~�r`9�����=Z�vP\h�=�s����":`*��|��`�`�"�s���l�7�,�w(��C3U�i�����[��1j�iF ����h��3� ~�� Specifically, it is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period of time, relative to the emissions of 1 ton of carbon dioxide (COEPA and other organizations will update the GWP values they use occasionally.
The Reporting Program collects data about some industrial gases that do not have GWPs listed in the AR4; for these gases, the Reporting Program uses GWP values from other sources, such as the Fifth Assessment Report.The United States primarily uses the 100-year GWP as a measure of the relative impact of different GHGs.
100 years. 500 years. In science communications, the EPA will refer to the most recent GWPs. For this Web page, we are presenting the range of the lowest to the highest values listed by the IPCC.The EPA considers the GWP estimates presented in the most recent IPCC scientific assessment to reflect the state of the science.