>>pbw+C5
That's what I want to read -- How do giant populations deal with mega changes [1]? Can we get to a place where the mega change would wipe out civilization as we know it and what would that look like? What could we do to prevent it and how likely is it to happen?
If it's not climate change it would just be something else (though -- most of the falling civilizations in my link do fall at least partly to climate change. The sea peoples wrecking the bronze age was very likely due to that and mass migration)
[1]: https://www.youtube.com/@FallofCivilizations