Shoot some cows??
If one believes in global warming, shouldn't one be out there shooting cows rather than worrying about airplanes?
Over the same time period as the establishment of the Aviation business - say, about 60 years, the Industrialisation of the production of cows has grown at a much faster rate.
Man did not have domestic cows 100 years ago. A few farmers had a very few, but they were prohibitively expensive and only less than 0.1% of the population ate Beef..
As each cow is worse at global warming than each plane flight, I guess we all ought to buy some guns and shoot some cows.