But the purpose of money is exactly to be a currency to be spent on choices. And, I must unfortunately repeat myself with regards to what I wrote nearby, externalities can be charged as a cost - and it is probably the way to handle it. "You pollute, you pay" - then, you acquire money to invest it, especially in activities with downsides.

I don't support the idea as described, but playing devil's advocate presumably it would shift demand towards train and boat travel. That would push tourism closer to home and largely eliminate visiting other continents for those who couldn't either afford the air travel tax or to take several months off of work if going by boat. But it wouldn't eliminate tourism by any means. Even the poor could still easily travel the better part of a given continent.

Exactly. The travel permits will still be easy to get for the elites and their friends. In fact I bet even the climate change academics, and their friends and anyone they went to school with, will be able to get their travel permits just fine. You and me though? F your family, you’ll never see them again. The climate simply can’t spare it.

These people are so out of touch it’s bananas.

I didn't say tax everyone the same amount. Make it hurt. Tax the elite a million per flight.

And yes, no tourist income. It's dirty money.