Richard Heinberg is a Senior Fellow of the Post Carbon Institute and is widely regarded as one of the world's foremost educators about the need to transition away from fossil fuels. He has authored twelve books, including The Party's Over: Oil, War, and the Fate of Industrial Societies and Afterburn: Society Beyond Fossil Fuels, and scores of essays and articles that have appeared in such journals as Nature, The American Prospect, The Pacific Standard, Public Policy Research, Quarterly Review, The Ecologist, Resurgence, The Futurist, European Business Review, Earth Island Journal, Yes!, and The Sun. David Fridley has been a staff scientist at the Energy Analysis Program at the Lawrence Berkeley National Laboratory in California since 1995. He is also Deputy Group Leader of Lawrence Berkeley's China Energy Group, which collaborates with China on end-user energy efficiency, government energy management programs, and energy policy research. Fridley has written and spoken extensively on the energy and ecological limits of biofuels and serves as Renewable Energy & Energy Efficiency Fellow at Post Carbon Institute.