Flagstaff, AZ – In his latest book The Dominant Animal biologist Paul Ehrlich and his wife explain how we can learn from our cultural evolution to see where we're going. They say humans have become so powerful that they take the environment for granted. The Ehrlichs give many examples throughout history of humans devastating impact on the environment. Ehrlich recently stopped by KNAU's studios to talk to Arizona Public Radio's Laurel Morales. He told her a lot has changed since he wrote The Population Bomb.