Did Drought Kill Advance Civillisations?

Major droughts may have spurred the demise of multiple cultures and cities in pre-Hispanic Mexico over the last millennium.

A new study, which used tree rings to add many hundreds of years to the region’s climate record, pinpointed four severe droughts in the region over the last 1,200 years. Some were far more intense and prolonged than anything ever seen in modern meteorological records, and many coincided with major historical events.

One, for example, lasted for 25 years around the year 900 and accompanied the end of a flourishing era of Mayan city-states.

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