As Michigan State Professor Harm de Blij tells Betsy in this fascinating interview, "Geography is the only science that combines analysis of natural environments in the context of human society." So why have Americans become so ignorant of Geography, just at the moment when the Earth and its problems are ever more inter-related? Professor de Blij’s new book, Why Geography Matters: Three Challenges Facing America: Climate Change, the Rise of China, and Global Terrorism, answers, and guides us forward. LISTEN (12 min)