population projection
A mathematical calculation of the size and structure of a future population based on current levels of fertility, mortality, and migration. Projections are hypothetical scenarios, not estimates or forecasts (which may assume changing levels of fertility, etc.). Given the uncertainties involved, demographers increasingly make probabilistic projections, e.g. that it is 80 per cent probable that the world population will lie between 7.4 and 10.4 billion by 2050 (... ...
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