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Thus, the energy return on energy investment (EROEI) needed to be &amp;gt;1. Recent studies have indicated that this may not be the case for modern industrialized agrifood systems (AFSs). Although the green revolution radically improved agricultural yields, it came at the expense of increased energy inputs, mainly in the form of fossil fuels. AFSs relying on external energy pose a food security risk, an economic issue for agricultural producers, and an environmental issue for all. Previous EROEI studies investigated mainly certain groups of commodities, typically at the local or national level. Here, a comprehensive global analysis shows that current AFSs have a lower EROEI than previously estimated. Globally, EROEI has increased from 0.68 in 1995 to 0.91 in 2019. In low-income regions, AFSs are still energy sources, but their EROEI has declined with increasing wealth, reflecting the growing utilization of fossil fuels. AFSs of high-income regions are energy sinks, although their EROEI has improved. Food processing is responsible for 40% of the total energy use in the global AFS, notably larger than fertilizer, which accounts for 17%. More than half of the energy use in food processing is for livestock products that also require disproportionate energy input through their inefficient conversion of (human-edible) feed. Livestock products use 60% of energy inputs while delivering &amp;lt;20% of food calories.<\/jats:p>","DOI":"10.1093\/pnasnexus\/pgae524","type":"journal-article","created":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T13:02:00Z","timestamp":1734440520000},"source":"Crossref","is-referenced-by-count":14,"title":["Energy input and food output: The energy imbalance across regional agrifood systems"],"prefix":"10.1093","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9853-4032","authenticated-orcid":false,"given":"Kajwan","family":"Rasul","sequence":"first","affiliation":[{"name":"Industrial Ecology Programme, Department of Energy and Process Engineering, Norwegian University of Science and Technology , Trondheim 7034 ,","place":["Norway"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1405-7951","authenticated-orcid":false,"given":"Martin","family":"Bruckner","sequence":"additional","affiliation":[{"name":"Institute for Ecological Economics, Department of Socioeconomics, Vienna University of Economics and Business , Vienna 1020 ,","place":["Austria"]},{"name":"Institute for Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich , Z\u00fcrich 8049 ,","place":["Switzerland"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9114-0102","authenticated-orcid":false,"given":"Finn","family":"Mempel","sequence":"additional","affiliation":[{"name":"Department of Geography, University of Zurich , Z\u00fcrich 8057 ,","place":["Switzerland"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Trsek","sequence":"additional","affiliation":[{"name":"Institute for Ecological Economics, Department of Socioeconomics, Vienna University of Economics and Business , Vienna 1020 ,","place":["Austria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4934-3421","authenticated-orcid":false,"given":"Edgar G","family":"Hertwich","sequence":"additional","affiliation":[{"name":"Industrial Ecology Programme, Department of Energy and Process Engineering, Norwegian University of Science and Technology , Trondheim 7034 ,","place":["Norway"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2024,12,17]]},"reference":[{"key":"2024122016482831000_pgae524-B1","doi-asserted-by":"crossref","DOI":"10.5040\/9798400646133","volume-title":"Energy transitions: history, requirements, prospects","author":"Smil","year":"2010"},{"key":"2024122016482831000_pgae524-B2","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1177\/2053019613518033","article-title":"A sociometabolic reading of the Anthropocene: modes of subsistence, population size and human impact on Earth","volume":"1","author":"Fischer-Kowalski","year":"2014","journal-title":"Anthropocene Rev."},{"key":"2024122016482831000_pgae524-B3","doi-asserted-by":"crossref","first-page":"2319","DOI":"10.1038\/s41467-021-22581-7","article-title":"Energy implications of the 21st century agrarian transition","volume":"12","author":"Rosa","year":"2021","journal-title":"Nat Commun"},{"key":"2024122016482831000_pgae524-B4","doi-asserted-by":"publisher","DOI":"10.2873\/562299"},{"key":"2024122016482831000_pgae524-B5","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1126\/science.182.4111.443","article-title":"Food production and the energy crisis","volume":"182","author":"Pimentel","year":"1973","journal-title":"Science"},{"key":"2024122016482831000_pgae524-B6","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1126\/science.184.4134.307","article-title":"Energy use in the U. 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