Large Methane Release Could Cause Abrupt Climate Change As Happened 635 Million Years Ago

An abrupt release of methane about 635 million years ago from ice sheets caused a dramatic shift in climate, triggering a series of events that effectively ended the last "snowball" ice age. Methane clathrate destabilization acted as a runaway feedback to increased warming, and was the tipping point that ended the last snowball Earth.

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