Comment by konschubert

One also has to consider that the methane decays over a matter of decades. Other than CO2, which stays in the atmosphere until it is taken out.

So, even if methane takes a big share in current greenhouse emissions, its share in the accumulated greenhouse gases in the atmosphere will be lower.

The climate change it causes is temporary. (Disregarding runaway effects.)

https://en.wikipedia.org/wiki/Atmospheric_methane