forward. i suspect luke many people i of course try to change my behavior when i travel up to my constituency. i always travel with the train. but i didn t do enough. i am acutely aware i didn t do enough. i wish i could. i would do more. part of the problem because you referred to airplanes and you are quite right. flight, when they are able to fly and there is not too much volumeic ash creates a growing proportion of the co2 emission. what is irrational is the moment you have a tax system that taxes passengers in airplanes. that means planes are not taxed for the pollution they caused. planes are half empty or barely has passengers at all. if you change that to a per plane tax you will make a