"...it started most likely with a volcano, the authors think, which pumped enough greenhouse gases into the atmosphere to trigger a modest amount of warming, similar perhaps to the amount we've seen over the last several decades.
"What happened next is the important part. The earth became warm enough that icelike structures in the ocean melted, releasing massive amounts of methane that bubbled up, fueling rapid warming of the atmosphere. While carbon is more long-lived, methane is more than 20 times more potent as a greenhouse gas."
Article by Dan Shapley, thedailygreen.com
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