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Climate variability and change
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==== Humanity ==== Collapses of past civilizations such as the [[Maya civilization|Maya]] may be related to cycles of precipitation, especially drought, that in this example also correlates to the [[Western Hemisphere Warm Pool]]. Around 70 000 years ago the [[Toba Volcano|Toba supervolcano]] eruption created an especially cold period during the ice age, leading to a possible [[Toba bottleneck|genetic bottleneck]] in human populations.
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