Alarmism. Societal change is inevitable, societal collapse is not. Society has survived a hell of a lot. Chinese society survived the Mongols. European society survived losing a third of its population to the black plague. Is climate change going to wipe out a third of the world population anytime soon? I doubt it.
A big difference now is the ease of mobility. A catastrophe in equatorial Africa a thousand years ago didn’t result in mass migration to Southern Africa. A catastrophe today will result in massive mobilization from one locale to another. The only example I can think of of mass migration was the steppes peoples but even that wasn’t that quick to happen.
The societal collapse so great that we forgot and had to reinvent writing after it had existed for millennia.