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Africa agricultural Air pollution anchovy annual average Bangladesh birth rates capita carbon dioxide century cities climatic changes competition consumption cost crowding death decline deforestation developing countries disease earth ecological economic growth effects efforts energy environment environmental estimated expand extinction fertilizer firewood food production forests fossil fuels global growth in demand growth rate health services housing human population India industrial inflation irrigation labor force land Latin America limited living mand Maximum Sustainable Yield Middle East million tons mineral nearly needs North America northern Great Plains overfishing overgrazing parks percent petroleum plant and animal political poor countries population density population growth population pressure population problem projected protein rainfall rapid population growth rapidly recent regions requires reserves result rising rural areas scarcity schistosomiasis seventies shantytowns social soil erosion species stress Today trends United urban waste water supplies world fish catch World Grain world's population Worldwatch Institute