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Controlling our Numbers
Population Growth and Age Structure 881
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abortion adequate adult advantage algae already animals artificial atmosphere Australopithecus average babies behaviour birth birthrate bombs Britain build carbon dioxide cent certainly chapter chemical cities computers contraception cost countries course dangerous density deuterium difficult disease doubling earth effective efficiency eighty entirely factor fighting food supply give growth heat Homo erectus human hundred hydrogen important increase individual inhibitions intelligence killed kilogrammes kilometres kilowatts large number larger larvae less limit living major material methods millimetre million million multiply natural natural selection nuclear ocean organisms parasites perhaps period plankton plants population population density possible predators present pressure problem produce protein radiation reach red grouse reduce refrigerators reproduction result rhythm method scale serious space species square kilometres square metre storeys suppose surface survive technical temperature territory tion tons tungsten unlikely weight whole