Did climate influence Angkor's collapse? Evidence suggests changing environment can bring down a civilization

Decades of drought, interspersed with intense monsoon rains, may have helped bring about the fall of Cambodia's ancient Khmer civilization at Angkor nearly 600 years ago, according to an analysis of tree rings, archeological remains and other evidence. The study may also shed light on what drives -- and disrupts -- the rainy season across much of Asia, which waters crops for nearly half the world's population.

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