Transcription of The IPAT Equation - MIT
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The IPAT Equation - MIT
The IPAT EquationThe IPAT EquationThe IPAT EquationThe IPAT EquationReferencesEhrlich, and Holdren,1972. Critique: One Dimensional Ecology. Bulletin of the Atomic Scientists28(5): 16, 18-27. Commoner, Barry. The Environmental Cost of Economic Growth. in Population, Resources and the Environment. Washington, DC: Government Printing Office Pp. 339-63, the ProblemServices&GoodsImpactPersonService s & Goods PopulationImpact =TA P I = The IPAT Equation is a mathematical identity that shows that the underlyingenvironmental problems are related to scale . Growth in Population and Affluence have exceeded improvements in Technology. Furthermore the termsin the Equation are highly coupled!for infinitesimalsTTAAPPII + + = Population GrowthAffluence = GWP per captiaTechnologyRINP0 ROUT][ ][emigrationnimmigratiodeathbirthR + = PRdtdP =Population BdtRPdP =tRoePP =noiPP)1(+=in the discrete form Currently i 1%We are adding 70-80 M people/yrAdd one Germany or 2X Canada each yearAffluence and GDP, GWP GDP = Gross Domestic Product GWP = Gross Worl
Disaggregating the Problem Goods&Services Impact Person Goods & Services Impact =Population × × I =P ×A ×T The IPAT equation is a mathematical identity that shows that the underlying environmental problems are related to fiscalefl. Growth in Population and Affluence have exceeded improvements in Technology. Furthermore the terms
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