Some scientists now proudly claim that the food problem is on the verge of being completely solved by the imminent conversion on an industrial scale of mineral oil into food protein—an inept thought in the view of what we know about the entropic problem. The logic of this problem justifies instead the prediction that, under the pressure of necessity, man will ultimately turn to the contrary conversion, of vegetable products into gasoline (if he will still have any use for it).
Nicholas Georgescu-Roegen (1973)
Abstract
While various energy-producing technologies have been analyzed to assess the amount of energy returned per unit of energy invested, this type of comprehensive and comparative approach has rarely been applied to other potentially limiting inputs such as water, land, and time. We assess the connection between water and energy production and conduct a comparative analysis for estimating the energy return on water invested (EROWI) for several renewable and non-renewable energy technologies using various Life Cycle Analyses. Our results suggest that the most water-efficient, fossil-based technologies have an EROWI one to two orders of magnitude greater than the most water-efficient biomass technologies, implying that the development of biomass energy technologies in scale sufficient to be a significant source of energy may produce or exacerbate water shortages around the globe and be limited by the availability of fresh water.
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Acknowledgments
Kenneth Mulder was supported by a grant from the Andrew W. Mellon Foundation. Nate Hagens was supported by a grant funded by the Moore Foundation. Brendan Fisher was supported by a grant from the Leverhulme Trust.
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Mulder, K., Hagens, N. & Fisher, B. Burning Water: A Comparative Analysis of the Energy Return on Water Invested. AMBIO 39, 30–39 (2010). https://doi.org/10.1007/s13280-009-0003-x
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DOI: https://doi.org/10.1007/s13280-009-0003-x