This week we're learning more about the fossil fuel that powered humanity's first industrial age, and helped set us on a course for a looming climate crisis. We'll speak to Richard Martin, energy editor at the MIT Technology Review, about his book "Coal Wars: The Future of Energy and the Fate of the Planet." And we'll explore the environmental impact of coal with Jeff Deyette, assistant director of energy research in the Climate and Energy program at the Union of Concerned Scientists.