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Avoiding one long flight probably saves more carbon than a year of switching from eating meat to eating vegan. Also as others pointed out, not having kids would be by far more impactful by default.
I already fly only if there's no alternative, and usually once a year to see my family. I know a lot of people that basically also make one trip per year. For these people, going vegan would be much easier than further reducing flying.
I don't like the anti-kids arguments. Even better for the environment than not having kids is suicide but no one goes around suggesting that. Having kids is a very personal choice and someone has to do it, or we'll be in a very bad place soon.
(virtually) No one is suggesting suicide. The "kids argument" is just something to consider. It's one of several reasons I chose not to. I find it highly dubious that one datapoint is going to tip someone over the edge that will later regret it.
Yes, flights are a huge deal. One really long flight (like to the other side of the planet) should still be less co2e pollution than a non-vegan diet for a year, but not by much.
No doubt that flying often is the biggest impact, but most people don't fly often.