Methane muted: How did early Earth stay warm

Methane muted: How did early Earth stay warm Riverside CA (SPX) Oct 07, 2016 - For at least a billion years of the distant past, planet Earth should have been frozen over but wasn't. Scientists thought they knew why, but a new modeling study from the Alternative Earths team of the NASA Astrobiology Institute has fired the lead actor in that long-accepted scenario. Humans worry about greenhouse gases, but between 1.8 billion and 800 million years ago, microscopic ocea ... more

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