Sudden Draining of 2 Lakes Said to Have Caused Prehistoric Global Cooling

By KIM A. McDONALD

The most abrupt, widespread cooling of earth during the past 10,000 years occurred when an ice dam blocking the water of two giant lakes collapsed and sent the water rushing into Canada's Hudson Strait 8,200 years ago.

A team of U.S. and Canadian scientists reached that conclusion after examining sediment and microscopic fossils underlying the former lakes in Canada's Hudson Bay region. The study, presented in

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Sudden Draining of 2 Lakes Said to Have Caused Prehistoric Global Cooling

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