The biggest climate problem you aren't thinking about

In the next 25 years, the world will have to produce 50% more food -- and most of our habitable land is already devoted to the production of food. In order to feed ourselves, we risk doing even more damage to the climate as more land is given over to agriculture. In his provocative new book We Are Eating the Earth: The Race to Fix Our Food System and Save Our Climate, Michael Grunwald explores the cutting edge of food technology, the politics of food, and the challenges the whole world faces. He joins Paul for a discussion about the book.