“By this standard, the entire planet and virtually every nation is already vastly overpopulated.”

—  Paul R. Ehrlich

The Population Explosion (1990)
Context: The key to understanding overpopulation is not population density but the numbers of people in an area relative to its resources and the capacity of the environment to sustain human activities; that is, to the area’s carrying capacity. When is an area overpopulated? When its population can’t be maintained without rapidly depleting nonrenewable resources.... By this standard, the entire planet and virtually every nation is already vastly overpopulated.

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Paul R. Ehrlich photo
Paul R. Ehrlich 11
American scientist and environmentalist 1932

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