Snowball Earth

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Snowball Earth

by Discovery Channel 3:47 mins

Snowball Earth

by Discovery Channel 3:47 mins

Up to 3 times in the past 2.4 billion years, Earth has become a desolate "snowball" with average global temperatures less than -70 degrees Fahrenheit. Only a runaway greenhouse process created by volcanic activity has saved the planet from an icy fate.

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