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thatguy9012 t1_izgrthj wrote

I don't think anyone really knows. Maybe mass migration due to the long term effects of natural climate change.

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Gideonn1021 OP t1_izh2k7m wrote

A mass migration to more populated and thriving civilizations? If say conditions were generally getting worse wouldn't cities be the first to suffer while smaller populations could survive and as such people would vacate cities, or is it the other way around, I am unsure

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