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Planet Earth

Mass Extinctions Past and Future

The LoomBy Carl ZimmerDecember 16, 2007 11:15 PM

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I've got a new conversation up at bloggingheads.tv. This time around I talk to University of Washington paleontologist Peter Ward about the mass extinctions that wiped out millions of species in the past, and how disturbingly difficult it is to rule out the possibility that we're sending ourselves into another great die-off.

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