Ehrlich, Paul R. Ehrlich & Anne H. (1990). The population explosionArchived 2014-12-06 at the वेबैक मशीन. London: Hutchinson. pp. 39–40. ISBN 0091745519. Retrieved 27 जुलाई 2014. "When is an area overpopulated? When its population can't be maintained without rapidly depleting nonrenewable resources [39] (or converting renewable resources into nonrenewable ones) and without degrading the capacity of the environment to support the population. In short, if the long-term carrying capacity of an area is clearly being degraded by its current human occupants, that area is overpopulated."
Ehrlich, Paul R. Ehrlich & Anne H. (1990). The population explosionArchived 2014-12-06 at the वेबैक मशीन. London: Hutchinson. pp. 39–40. ISBN 0091745519. Retrieved 27 जुलाई 2014. "When is an area overpopulated? When its population can't be maintained without rapidly depleting nonrenewable resources [39] (or converting renewable resources into nonrenewable ones) and without degrading the capacity of the environment to support the population. In short, if the long-term carrying capacity of an area is clearly being degraded by its current human occupants, that area is overpopulated."
