Let me ask you: Do you have days when you feel we are doomed as a species? That's every day, for our next guest.
When a successful Professor of Natural Resources, Ecology, and Evolutionary Biology left the University of Arizona, for his mud hut retreat, he probably didn't intend to stir up the world. But that's just what Guy McPherson has done. He's becoming a voice for the worst fears of many people. In fact, McPherson says climate change has gone so far, so fast, humans will become extinct before 2050.