Pound for pound, the comparative impact of CH4 on climate change is over 20 times greater than CO2over a 100-year period.
Turns out in my previous post I may have made a mistake. Methane, CH4 , shares with other green house gases the ability to let light waves pass through to the earth, and the ability to reflect back on the earth infrared (radiant heat) waves, warming our world. I have seen it stated various ways but have opted for the one above which uses a lower number tied to a time frame which deals with the different live spans of both gases at high altitude.
So it may appear that methane will stress the earth at a slower pace, but a kill is a kill.