What are the benefits and challenges of eating a local, sustainable diet? We speak with Michael Pollan, author of "Omnivore's Dilemma," who argues that we should think globally and eat locally. And Joel Salatin, the organic farmer Pollan wrote about in his recent Mother Jones article, checks in from his farm in Virginia.

Plus, Jane Goodall tells us why she's still optimistic about the future of the environment, even in the face of today's environmental troubles. She's inspired by “the indomitable human spirit...people who tackle impossible tasks and won’t give up.”

Finally, we talk to Colonel Gerald Schumacher about the unprecedented number of contractors working for the military in Iraq. How many are in Iraq, and what are they working on? What are the potential problems with outsourcing tens of thousands of jobs to civilians? Schumacher is the author of “A Bloody Business: America’s War Zone Contractors and the Occupation of Iraq.”