yep. methane is one of the most destructive GHG's but its shorter lived than CO2 I believe.
Which we know does nothing to temperatures ar climate. So what?
What you 'know' and what reality is are obviously two very differant things.
Methane lasts about 15 years in the atmosphere before it is oxidized. It then forms CO2 and H2O. On a hundred year scale, CH4 is over 20 times as effective of a GHG as CO2. However, on a 10 year scale, it is over 100 times as effective of a GHG as CO2. Now we have pushed the level of CH4 from around 700 ppb to over 1800 ppb. That means the increase in heat trapped from the increase of 1000 ppb that is equivelent to 100 ppm of CO2.
So, effectively, right now, we are at the equivelent of over 500 ppm of CO2, when you count in the NOx and manmade GHGs. That is higher than the GHGs have been in about 20 million years. We will see effects from this in my lifetime and major effects in the lifetime of my children.