[Right_Wing_Madman]

Doomsayers such as Elon Musk warn that these shifts threaten civilisation itself. That is ridiculous

There's no rule or law that says civilization must be permanent. Worldwide civilizational collapse has already occurred four times in the past 5,000 years (Mesopotamian, Minoan, Assyrian, and Roman collapse). It took 1,400 years to fully recover from the collapse of the Roman Empire.

[MinorityRepublican]

It took 1,400 years to fully recover from the collapse of the Roman Empire.

More like 1,000 years. The Spaniards and the Portuguese colonized the New World after the Reconquista.