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1984. View through a window may influence recovery from surgery. Science 224(4647):420-421. H. A. Norton, in press. Applied ecology: towards a positive approach. Johannesburg, South Africa: Centre for Resource Ecology, 46 pp. R. , 1984. R. C. ), Limnological criteria for management of water quality in the southern hemisphere, South African National Scientific Programmes Report No. 93. Pretoria: Foundation for Research Development, 181 pp. World Bank, 1982. Tribal peoples and economic development: human ecologic considerations.

Stout, 1986. Conserving biological diversity in our national forests. Washington, DC: Wilderness Society, 116 pp. F. W. Gange, 1985. Therapeutic uses oflight. Ann. Y. Aca. Sci. 453:356-364. W. ), 1975. The economics of natural resource depletion. London: Macmillan, 220 pp. , 1983. The limits of cost-benefit analysis as a guide to environmental policy: a reply to Professor Cooper. Kyklos 36(1):112-114. , 1984. Cost-benefit analysis: issues and methodologies. Baltimore, MD: Johns Hopkins University Press, 158 pp.

Government to pursue similar long-term studies of the interaction of population, natural resources, and environmental trends within their borders. , to assist these nations and Introduction 19 others in planning and executing their own studies. It was headed by Gerald Barney who headed the Global 2000 study. More than thirty ''Year 2000," "21st Century Studies," or similar studies were under way or have been completed by various governments or other organizations around the world (Table 3). Although these studies vary in the depth and extent of analysis, all present valuable resource-trend information and insights for national planners on strategies for affecting the future of peoples and nations.

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