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(More bad news)
Atmospheric sciences have a measurement, the GWP, The Global Warming Potential. The GWP was developed to allow comparisons of the global warming impacts of different gases.
CO2, by definition, has a GWP of 1
Methane CH4 is estimated to have a GWP of 28–36
Kayrros Surveillance Technology Reveals Dramatic and Unexpected Annual Increase in Large Methane Leaks.
https://www.kayrros.com/wp-content/uploads/2020/10/201014_Kayrros-Methane-Emissions-PR.pdf