Das 4,2-Kilojahr-Ereignis war eine Klimaphase etwa von 2250 bis 2100 v.Chr., also vor etwa 4200 Jahren ("4,2 Kilojahre") mit Dürren von Nordamerika über den Nahen Osten und Indien bis nach China, die Auswirkungen auf eine Reihe von frühen Hochkulturen in diesen Regionen hatte.

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