Ninety-one nations are not producing enough children to maintain their current populations, while the opposite is true in 104 countries where high birth rates are driving population increases, according to a new scientific study. Total fertility rates (TFR), a summary measurement representing the average number of children a woman would deliver over her lifetime, have declined since 1950.
from Latest Science News -- ScienceDaily https://ift.tt/2DwLGLD
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