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Weather Talk: Glaciation cycles likely related to ocean currents

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It is known from Antarctic ice core samples that our current Ice Age cycle between glacial periods and warmer interglacial periods went through a phase change about 900,000 years ago. 

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At that point, the glacial periods became much colder, and the length between ice advances increased from about every 41,000 years to about every 100,000 years. 

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