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Most of the heat-trapping or “greenhouse,” gas (GHG) released by our species is carbon dioxide (CO2). However, of late, more attention has been focused on the number-two GHG source, methane. In tonnage terms, CH4 accounts for 9% of total heat-trapping gasses released due to human activity, but it has received disproportionate blame. This is because: 1) it is associated with the energy industries; and, 2) pound-for-pound, it possesses about 21 times the heat-trapping potential of CO2. These higher greenhouse properties are offset, partially, by methane staying in the atmosphere for a much shorter time than CO2.

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