[SunkenCiv]

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The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization by Richard Firestone, Allen West, and Simon Warwick-Smith

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[muawiyah]

The "ice cap" over North American advanced and retreated in different places for different amounts of time during the last period of glaciation.

You really have to assume something similar happened in Europe and Asia.