This is a massive and important study, in which all relevant U.S. government agencies participated, of world trends in population, natural resources, and the environment. What emerges is a set of global problems of fairly alarming proportions. Serious stresses by the year 2000 are clearly visible in a world more crowded (6.35 billion as compared to 4 billion population in 1975), far more polluted, less stable ecologically, and more vulnerable to disruption. The progressive impoverishment of the world's natural-resource base raises concerns about the earth's capacity to continue to provide for human needs. Because this study is more comprehensive and moderate in tone than many others-such as the Club of Rome's-it may have greater credibility.
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