Robust population data exist only for the last two or three centuries Walter greiling projected in the 1950s that world population would reach a peak of about nine billion in the 21st century and then stop growing after an improvement in public health in less developed countries Until the late 18th century, few governments had ever performed an accurate census.
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World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics
[2] the population of the world reached [15] the world population more than tripled during the 20th century from about 1.65 billion in 1900 to 5.97 billion in 1999 [16][17][18] it reached the 2 billion mark in 1927, the 3 billion mark in 1960, 4 billion in 1974, and 5 billion in 1987 [19] the overall population of the world is approximately 8 billion as of november 2022.
Population growth was also unprecedented, [3] as the century started with around 1.6 billion people, and ended with around 6.2 billion [4] the 20th century was dominated by significant geopolitical events that reshaped the political and social structure of the globe World war i, the spanish flu pandemic, world war ii and the cold war. In the 18th century world population entered a period of accelerated growth
European population reached a peak growth rate of 10 per thousand per year in the second half of the 19th century.
