Long-lost Lake Agassiz offers clues to climate change

What caused water levels to drop in immense yet long-vanished Lake Agassiz? New research suggests that conditions 12,000 years ago encouraged evaporation. Not long ago, geologically speaking, a now-vanished lake covered a huge expanse of today's Canadian prairie. Although Lake Agassiz is gone, questions about its origin and disappearance remain. Answers to those questions may provide clues to our future climate.

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