David Pimentel, professor of ecology and agriculture at Cornell University, and Mario Giampietro, senior researcher at the National Research Institute on Food and Nutrition ( INRAN ), place in their study Food, Land, Population and the U. S. Economy the maximum U. S. population for a sustainable economy at 200 million.

David Pimentel, professor of ecology and agriculture at Cornell University, and Mario Giampietro, senior researcher at the National Research Institute on Food and Nutrition ( INRAN ), place in their study Food, Land, Population and the U. S. Economy the maximum U. S. population for a sustainable economy at 200 million.

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