So if you are a frequent flyer types, here’s some quick back of the envelope math.
About 50k miles a year usually corresponds to gold status with most airline programs (star alliance, skyteam etc). I haven’t done any rigorous calculations yet but it appears that flying that much would generate about 13 tons of CO2. Now offsetting your footprint is ridden with a lot of moral questions and arguments that I am not going to get into. But it seems to cost about $10-$25 to offset 1 ton of CO2. So if you fly 50k miles a year, that’s about $200/yr to offset it all, give or take. Put another way, a single San Francisco to London round trip will be about 3 ton of CO2, offsetting which will cost around $50.
So in general, for about 5% of your economy ticket price, you can do some good that kinda seems to even out among some dimensions you choose.
I don’t know of good options to do that but I ended up using GoldStandard just to try it out in case anyone is interested. And if someone knows some other offsetting resources they like, please share!