From what I understand - I am no scientist though, air travel contriburtes 2%.
There will be people who shout me down but when airlines hike prices to so called counteract this problem it is just one money making scam and puts money in the pockets of the airlines.
What did the Balerics do with the so called eco tax that they put on each visitor a few years ago?
This false taxing puts tavel - In my opinion one of the most mind widening things a person can do - in danger of being out of reach to all but the rich.
There were loads of planes around during the last ice age.........not !!!!

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Kiss
God laughs at people who make plans.