World Population Milestones:
- one billion in 1st half of 19th century (1800s)
- 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 2022
Source 1
Source 2
Date: September 3rd, 2024
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