Climate change destroyed Mayan Civilization and Tang Dynasty

That's the conclusion of recent research--that China's Tang Dynasty and the Mayan civilization. According to an article in The Australian,

There has never been a satisfactory explanation for the fall of the Tang emperors, whose era is viewed as a high point of Chinese civilisation, while the disappearance of the Maya world perplexes scholars.
Now a team of scientists has found evidence a shift in monsoons led to drought and famine in the final century of Tang power. The weather pattern may also have spelt doom for the Maya in faraway Mexico at about the same time, they say.
Both ruling hierarchies at the start of the 10th century were victims of poor rainfall and starvation among their peoples when the harvests failed.

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