Over hundreds of years it breaks down but even a century from now it's 30x worse. That doesn't sound right. Most sources I've seen[1] say that atmospheric met

Over hundreds of years it breaks down but even a century from now it's 30x worse. That doesn't sound right. Most sources I've seen[1] say that atmospheric methane has about a 10 year half life. I think the 30x figure you refer to actually represents the sum of methane's annual impact over 100 years. Despite the greater immediate efficacy as a greenhouse gas, the amount of methane remaining after a century should be so small that the impact in the 101st year would be extremely (likely unmeasurably) low. [1] For example, https://en.wikipedia.org/wiki/Atmospheric_methane https://en.wikipedia.org/wiki/Atmospheric_methane