Large Methane Release Could Cause Abrupt Climate Change As Happened 635 Million Years Ago. Science Daily, May 29, 2008. "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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