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Africa agricultural Algeria anchovy annual average Bangladesh become birth rates capita carbon dioxide century cities competition consumption cost crowding death decade decline deforestation developing countries disease dust earth's ecological economic growth effects energy environment environmental estimated extinction fertilizer firewood food production forests fossil fuels fresh water global growth in demand growth rate health services housing human population India industrial inflation irrigation Kenya labor force land Latin America limited living mand Middle East million tons mineral natural 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