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How Earth鈥檚 terrifying journey into the deep freeze started with fire, not ice. 800 million years ago, long before the age of the dinosaurs, indeed any animal life, the giant supercontinent Rodinia broke up. Earth鈥檚 vast powerful tectonic forces ripped the land apart, kicking off a series of events that resulted in huge amounts of carbon dioxide being sucked from the atmosphere and sending global temperatures plummeting.