Our population is consuming about 30% more trees, fish and fossil fuels than the planet can regenerate. How big a hole can we dig before we can't get out of it? Kai Ryssdal talks with Jared Diamond, a geography professor at UCLA.
Steve Henn figures his typical family breakfast journeyed 6,000 miles to his kitchen table. It's a symptom of the ever-growing global food trade, and the fossil fuel cost required to move commodities across the planet is growing with it.