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In: Preserving the global environment: the challenge of shared leadership, edited by Jessica T. Mathews. New York, New York/London, England, W. W. Norton, 1991. 39-77.The thesis that human population growth will eventually destroy the equilibrium of the world ecosystem, because environmental strain is a nonlinear effect of the linear growth, is embellished with discussions of technology and resulting pollution, population dynamics, birth and death rates, effects of expanded education, causes of urbanization, time constraints and destabilizing effects of partial development and the debt crisis. It is suggested that the terms renewable and nonrenewable resources are paradoxical, since the nonrenewable resoureces such as minerals will always exist, while renewable ecosystems and species are limited. The competitive economy actually accelerates destruction of biological resoureces because it overvalues rare species when they have crossed the equilibrium threshold and are in decline. Technological outputs are proportional to population numbers: therefore adverse effects of population should be considered in billions, not percent increase even though it is declining. Even the United Nations does not have predictions of the effects of added billions, taking into account improved survival and decreased infant mortality. Rapid urbanization of developing countries and their debt crisis have resulted from political necessity from the point of view of governments in power, rather than mere demographics. Recommendations are suggested for U.S. policy based on these points such as enlightened political leadership, foreign aid, and scientific investment with the health of the world ecosystem in mind rather than spectacle and local political ideology.