[Zild]

The answer is actually not that easy to find when searching for less than 5 minutes.

The amount of CO2 in the atmosphere is apparently 440 ppm. CH4 (methane) is 1.85 ppm.

At identical concentration levels CH4 is 84 times more impactful greenhouse effect than CO2 over the course of 10 to 20 years and 28 over 100 years. So it should be about 35% of the global CO2 effect short term (which is not the total but close, probably ?), so highly significant. Curiously the number that I found is around 10-20% so either my numbers are wrong or other graphs I found use confusing units.

[quickthrower2]

440PPM?

Yikes: https://news.ycombinator.com/item?id=12608421 seems like yesterday