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A late human population bottleneck is postulated by some scholars at approximately 70,000 years ago, during the Toba catastrophe, when Homo sapiens population may have dropped to as low as between 1,000 and 10,000 individuals.
Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
In 1972, an analysis of human hemoglobins found very few variants, and to account for the low frequency of variation human population must have been as low as a few thousand until very recently. [62] More genetic studies confirmed an effective population on the order of 10,000 for much of human history.
Based on a dataset of average population density of hunter-gatherer groups collected by Lewis R. Binford, which indicate a mean density of 0.1223 humans per km 2 and a median density of 0.0444 humans per km 2, the combined human population of Africa and Eurasia at the time of the LGM would have been between 2,998,820 and 8,260,262 people.
This is a list of countries showing past life expectancy, ranging from 1950 to 2015 in five-year periods, as estimated by the 2017 revision of the World Population Prospects database by the United Nations Population Division. Life expectancy equals the average number of years a person born in a given country is expected to live if mortality ...
U.S. population growth dipped to its lowest rate since the nation’s founding during the first year of the pandemic as the coronavirus curtailed immigration, US population hit its lowest rate in ...
The US population grew by just 0.1% in 2021 — measured from July 2020 to July 2021 — which is the slowest growth rate on record since 1900.
New data from the U.S. Census Bureau conclude that U.S. population grew at a slower rate in 2021 than in any other year since the nation's founding.