Our energy use and its consequences (including climate change) motivate some of the most contentious and complex public debates of our time. Although these issues are often cast in terms of renewable versus nonrenewable energy, in reality both depend on finite Earth resources. The evolution of the Earth itself therefore offers a uniquely illuminating perspective from which to evaluate alternative pathways toward energy and environmental sustainability. Geofuels: Energy and the Earth systematically develops this perspective using informal, nontechnical language laced with humor. It is well...