Description:Thomas Friedman talks about Hot, Flat & Crowded: Why We Need a Green Revolution -- And How It Can Renew America. Friedman explains how global warming, growing populations, and the expansion of the world's middle class have produced a planet that is "hot, flat, and crowded." It is being affected in ways that threaten to make it dangerously unstable. In this segment Friedman expounds on the countries that thrive solely due to their large amounts of oil.(4:09)