The world in 2050: more crowded, urban and aged.
Hagmann
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D000368:Aged; D019049:Developed Countries / Q000706:statistics & numerical data; D003906:Developing Countries / Q000706:statistics & numerical data; D005544:Forecasting; D006801:Humans; D011157:Population Dynamics; D011158:Population Growth; D014505:Urban Population / Q000639:trends*