title: World population beyond six billion.
mesh_terms: D001723:Birth Rate; D003710:Demography; D004467:Economics; D004522:Educational Status; D005298:Fertility; D005544:Forecasting; D005843:Geography; D008017:Life Expectancy; D008136:Longevity; D009026:Mortality; D011153:Population; D011157:Population Dynamics; D011158:Population Growth; D012106:Research; D012923:Social Class; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014505:Urban Population; D014507:Urbanization
keywords: Demographic Factors; Economic Factors; Educational Status--statistics; Estimation Technics; Fertility; Fertility Decline--statistics; Geographic Factors; Length Of Life; Life Expectancy--statistics; Mortality; Population; Population Dynamics--statistics; Population Growth--statistics; Population Projection--statistics; Research Methodology; Socioeconomic Factors; Socioeconomic Status; Spatial Distribution; Technical Report; Urban Spatial Distribution; Urbanization--statistics; World