On this edition of Conversations, Thomas M. Kostigen talks with host Dan Skinner about his latest book, “Hacking Planet Earth: How Geoengineering Can Help Us Reimagine the Future.” Kostigen is an award-winning author and journalist. His previous nonfiction books include “The Green Book: The Everyday Guide to Saving the Planet One Simple Step at a Time” and “You Are Here: Exposing the Vital Link Between What We Do and What That Does to Our Planet.”