National Public Radio: The most famous mass extinction is the one that ended the dinosaurs and some 50 percent of life on Earth about 65 million years ago. The culprit was mostly the impact with a large asteroid, about seven miles across, that hit the Yucatán Peninsula in Mexico. I wrote about some of the scary details a couple of months ago. But the Yucatán event pales in comparison with the mass extinction that happened 252 million years ago, at the end of the Permian period. Scientists estimate that about 95 percent...
URL: http://www.npr.org/blogs/13.7/2012/07/11/156487008/the-great-dying-and-climate-change
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