Except...methane has a shorter residency time is due to it turning into CO2 at a 7 year half-life, right? I keep hearing this from people who seemingly know a lot more than me about this stuff, and yet prima facie, it seems entirely wrong. It sounds equivalent to "we cause 7X the amount of short-term greenhouse effect, but eventually it drops down to 1X, and that's better than 1X from the get-go".
Does it turn into significantly less amount of CO2? How much less? If you can clear it up for me, I'd honestly really appreciate it.