> it's the best one can > do, I guess? You could just cut out the middle man and pay to sequester carbon directly, why do that with an airline at the point

> it's the best one can > do, I guess? You could just cut out the middle man and pay to sequester carbon directly, why do that with an airline at the point of sale? Some quick searching suggests that on hour of air travel is approximately 100 kg/hr of CO^2 per person. A 2x4 that's 12ft long weighs around 10 kg, burning a kg of wood releases around 1.5kg of CO^2. So, to a first approximation if you take a coast to coast flight in the US you'll come out around even if you buy around 35 (100x5.5/15) 2x4's, and then find some way to store those permanently. That's around a 10ft wide wall of 2x4's stacked side-by-side. Of course buying processed lumber just to store it is really inefficient, which is where carbon credits/offsets etc. come in.