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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Cool! I'll definitely check this out (especially since I just picked up Benton's When Life Nearly Died this past weekend).