Analyzes a simple model relating environmental pollution to population and per capita income and concludes that no single cause is sufficient to explain.... environmental problems, and that there is little about the pollution problems.... of the next 50 years that is inevitable." (Author/AL)

Despite the abundance, persistence, and worldwide distribution of DDT residues, they are not as freely available to the biota as might be assumed....Mere good fortune has protected man and the rest of the biota from much higher concentrations." (Author/AL)

Reports a test of the stability of the model used in Jay Forrester's World Dynamics''. When Forrester's fundamentally Malthusian assumptions were replaced by technological-optimist views, computer simulations predicted a stable population with increasing quality of life, rather than a population crash and decreasing quality of life. (AL)

A model estimating the contributions of sulfur compounds by natural and human activities, and the rate of removal of sulfur from the atmosphere, is based on a review of the existing literature. Areas requiring additional research are identified. (AL)

Major consequences of present and additional environmental quantities of DDT pesticide are predictable by mathematical models of transport, accumulation and concentration mechanisms in the Wisconsin regional ecosystem. High solubility and stability produce increased DDT concentrations at high organism trophic levels within world biosphere…

This article focuses on content of the United States' Department of State Study called the Global 2000 Report issued by the Carter Administration on July 24, 1980. The report discusses the present trends which will lead to a more crowded, more polluted world, vulnerable to disruption. (Author/SA)