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    In the meantime, we really should have a discussion about whether or not air travel is sustainable, and if we really need to travel so much. It's a luxury that Earth may not be able to afford.

Short answer: prooooobably not.

Long answer: lots of math followed by a proooooobably not. kb did some math a few weeks back but I am terrible at finding things on Hubski.

https://www.bbc.com/news/science-environment-49349566

https://en.wikipedia.org/wiki/Environmental_impact_of_aviation

but then again, what modes of travel involving fuel aren't bad for the environment?