title: World population: a major issue for the millennium.
mesh_terms: D003710:Demography; D011153:Population; D011155:Population Control; D011156:Population Density; D011157:Population Dynamics; D011158:Population Growth; D011640:Public Policy
keywords: Demographic Factors; Policy; Population; Population Control; Population Dynamics; Population Policy; Population Size; Social Policy; World; Zero Population Growth