599885 external_news 1513201262 1513201312 Some 4.5 billion years ago, the sun wasn't as bright and life-sustaining as it is today. That should have meant a planetary deep freeze, but primitive photosynthetic microbes may have kept things warm and toasty enough with their methane emissions to help simple organisms stay alive on the early Earth. That's the subject of new research from Chris Reinhard and Kazumi Ozaki with the School of Earth and Atmospheric Sciences. Reinhard is an assistant professor while Ozaki is a postdoctoral fellow.

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