Seeking a Break in a 252 Million-Year-Old Mass Killing An M.I.T. geologist wants to understand how an estimated 96 percent of all species on Earth became extinct at the end of the Permian Period 252 million years ago. CARL ZIMMER February 21, 2014 at 5:00AM http://nyti.ms/1ha964i The New York Times Science Endangered and Extinct Species, Geology, Greenhouse Gas Emissions

By CARL ZIMMER from NYT / Eethg. Corps. Inc. / Terrence Herschel G. Science http://nyti.ms/1ha964i

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