Mark Bittman has been in the center of the world of food and cooking for the past 40 years. He was a long-time columnist for the New York Times and has written more than 30 books. His latest is “Animal, Vegetable, Junk: From Sustainable to Suicidal. It’s a deep dive into the history of agriculture as far back as the Crusades. We talk about farming, the environment and the future of the planet. “Now What?” is produced with the help of Steve Zimmer, Tay Glass and Alex Wolfe. Audio production is by Nick Ciavatta.