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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/1196 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/1196 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/1196 archive 351 disk0/00/00/11/72 2016-01-15 01:46:40 2021-08-27 17:09:30 2016-01-15 01:46:40 monograph show 2 Marchetti C. 1619 pub iis_fag iis_ene prog_enp Energy analysis shows that, since the neolithic, agriculture has developed as a technology to reduce the amount of land necessary to support a given population. All technical discoveries and inventions were eventually bent to this final objective: intensification. The ratio of food-energy output per energy input, on the other hand, did remain remarkably constant, around a value of 40, till agriculture operated on a bootstrap basis. Basically, after World War II, the large-scale use of fossil fuels via machines and fertilizers drastically changed the trends, leading to an escalation in energy consumption per unit of product. The trend appears reversible, and the proper processes to be supported in view of a judicious long-term energy management are indicated. 1979-01 published WP-79-011 WP-79-011 195 public working_paper IIASA, Laxenburg, Austria 17 FALSE info:eu-repo/semantics/book