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The fertility rate in half of all nations is already too low to maintain their population size, an international team of hundreds of researchers reported in The Lancet.
Using a huge amount of global data on births, deaths and what drives fertility, the researchers tried to forecast the future for the world's population.
By 2050, the population of three quarters of all countries will be shrinking, according to the study by the US-based Institute For Health Metrics and Evaluation (IHME).
At the end of the century, that will be true for 97 percent -- or 198 out of 204 countries and territories, the researchers projected.
Only Samoa, Somalia, Tonga, Niger, Chad and Tajikistan are expected to have fertility rates exceeding the replacement level of 2.1 births per female in 2100, the study estimated.
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Using a huge amount of global data on births, deaths and what drives fertility, the researchers tried to forecast the future for the world's population.
By 2050, the population of three quarters of all countries will be shrinking, according to the study by the US-based Institute For Health Metrics and Evaluation (IHME).
At the end of the century, that will be true for 97 percent -- or 198 out of 204 countries and territories, the researchers projected.
Only Samoa, Somalia, Tonga, Niger, Chad and Tajikistan are expected to have fertility rates exceeding the replacement level of 2.1 births per female in 2100, the study estimated.
Global fertility rate to shrink by the end of the century, study says
The population of almost every country will be shrinking by the end of the century, a major study said Wednesday, warning that baby booms in developing nations and busts in rich ones will drive massive…
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