Proper noun
A formula attempting to describe the impact of human activity on the environment: I = P × A × T, such that the impact is a function of three factors: population, affluence, and technology.
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1997, National Research Council, Division of Behavioral and Social Sciences and Education, Board on Environmental Change and Society, Environmentally Significant Consumption: Research Directions IPAT is easily understood, frequently used for illustrative purposes and can discipline our thinking.