“The book Energy Return on Investment, self-deprecatingly put forth as a nontechnical ‘story,’ succeeds in providing a cohesive and intellectually rigorous theory that transcends economics and biology. …I highly recommend this book to policymakers and the business community to more accurately forecast the future, as well as to engineers and scientists of all disciplines. … Energy Return on Investment is technically relevant and written with accessible language.” (John R. Schramski, BioScience, July, 2018)







“In Energy Return on Investment, systems ecologist Charles A. S. Hall argues that to truly understand most investments, one must view them in terms of energy. … Energy Return on Investment is a solid introduction to a vital subject, and Hall is uniquely qualified to author it. Hall invented the very term energy return on investment, and he’s done decades of seminal research on the phenomenon that it describes.” (Frank Kaminski, resilience.org, April, 2018)

“In Energy Return on Investment, Dr. Hall has written an approachable and short introduction to how energy flows through and structures our world, ecosystems, and society. … Energy Return on Investment is an excellent primer with which to understand the world around us and make good investment choices for ourselves and the generations to come.” (Jon Freise, Resilience, resilience.org, June, 2017)