The world population on the threshold of the 21st century.
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D003148:Communism; D003247:Conservation of Natural Resources; D003710:Demography; D004467:Economics; D004777:Environment; D010684:Philosophy; D011056:Political Systems; D011153:Population; D011157:Population Dynamics; D012942:Social Sciences; D012950:Socialism; D012959:Socioeconomic Factors
Carrying Capacity; Demographic Factors; Demography; Economic Factors; Environment; Marxism; Natural Resources; Philosophical Overview; Political Systems; Population; Population Dynamics; Population Theory; Social Sciences; Socialism; Socioeconomic Factors; World