Energy - McElroy, Michael B. (Gilbert Butler Professor of Environmental Sciences, Gilbert Butler Professor of Environmental Sciences, School of Engineering and Applied Sciences, Harvard University)

How the world evolved to its present dependence on carbon-based fossil fuels, the problems that ensued including the threat of disruptive global climate change and hazards associated with our increasing dependence on unreliable but currently indispensable sources of energy such as oil, and the opportunities for a more sustainable energy future.