Th increase in methane has occurred at a much more rapid rate than CO2 in the same time period. This is an interesting thing to look at. However, it is still not as potent, as CO2 is measured in parts per million, while methane is still only measured in parts per billion. Additionally, the radiative force of methane is only about a third of the force generated from the increase between 1750 and 1998.
Methane traps heat much more efficiently than carbon dioxide. One pound of methane gas traps as much as 21 pounds of carbon dioxide. However, there is a lot more carbon dioxide than methane being produced currently, so CO2 is considered a greater threat.
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