The definitive CO2/CH4 comparison post
Real Climate
SEPTEMBER 19, 2021
There is also a very small impact of the CH 4 oxidation to CO 2 itself for any fossil-fuel derived methane. (a) In 2020, CO 2 was at ~410 parts per million, while CH 4 was around 1870 parts per <it>billion</it> (or 1.87 ppm, a factor of more than 200 smaller). W/m 2 for CH 4. The AR4 value for methane GWP-100 was 25.
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