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The world population has doubled between:
- 1181 and 1715
- 1715 and 1881
- 1881 and 1960
- 1960 and 1999
It’s expected to reach 9 billion by 2040.
An idler's miscellany of compendious amusements

The world population has doubled between:
It’s expected to reach 9 billion by 2040.