World population milestones
Notable milestones in the development of the world population / From Wikipedia, the free encyclopedia
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World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics.[3]
The population of the world reached
- one billion in 1804
- two billion in 1927
- three billion in 1960
- four billion in 1974
- five billion in 1987
- six billion in 1999
- seven billion in 2011
- eight billion in 2023
Old estimates put the global population at 9 billion by 2037–2046, 15 years after 8 billion, and 10 billion by 2054–2071, 17 years after 9 billion; however these milestones are likely to be reached far sooner.[6][needs update] Projected figures vary depending on underlying statistical assumptions and which variables are manipulated in projection calculations, especially the fertility variable. Long-range predictions to 2150 range from a population decline to 3.2 billion in the 'low scenario', to 'high scenarios' of 24.8 billion. One scenario predicts a massive increase to 256 billion by 2150, assuming fertility remains at 1995 levels.[7]
World population milestones in billions (UN estimates)[8] | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Population | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Year | 1804 | 1927 | 1960 | 1974 | 1987 | 1999 | 2011 | 2023 | 2037 | 2054 |
Years elapsed | 260,000 to 350,000 | 123 | 33 | 14 | 13 | 12 | 12 | 12 | 14 | 17 |
World population milestones in billions (USCB estimates) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Population | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Year | 1804 | 1927 | 1960 | 1974 | 1987 | 1999 | 2011 | 2023 | 2046 | 2071 |
Years elapsed | 260,000 to 350,000 | 123 | 33 | 14 | 13 | 12 | 12 | 12 | 23 | 25 |