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There could probably be some hybrid societies, although I have my doubts about irrigation as a lasting crutch. We see that if the climate changes are too volatile, irrigation can delay the inevitable, but typically not stop it. In any case, I imagine it to be a marginal affair, with the main...

One stand-out issue with the premise of "populations have to migrate, but then agriculture comes back elsewhere" is that our currunt interglacial has a high degree of long-term climate stability. There is a lot of evidence that during the glacial period, the entire planets saw a mucht higher...