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Incoming links: John Holdren
John Holdren Created 2026-10-24 Updated 2026-11-05
John Holdren and Paul R. Ehrlich analyzed environmental impact by separating the number of people from impact per person. Their 1971 paper writes an opening decomposition of the form , while allowing the per-person factor to depend on population size. The identity becomes predictive only when that factor is measured or modeled. This makes the assumptions visible when comparing changes in the number of people with changes in resource pressure per person, without presuming that the two factors vary independently.[ref]
Impact of Population Growth by Paul R. Ehrlich and John P. Holdren. 1971 paper, opening population-times-per-capita-impact decomposition
Portrait of John Holdren
. Office of Science and Technology Policy, official portrait, 24 April 2009. Public domain in the United States: OSTP employee’s official-duty federal-government work. Source usage terms, via Wikimedia Commons. Source.