Are We Pushing Earth's Environmental Tipping Points?

Jon Foley, director of the University of Minnesota's Institute on the Environment, talks with podcast host Steve Mirsky about his article in the April issue of Scientific American, "Boundaries for a Healthy Planet". Plus, we'll test your knowledge about some recent science in the news. Web sites related to this episode include snipurl.com/foleyplanet Learn more about your ad choices. Visit megaphone.fm/adchoices