User:Noe/World population milestones

Milestones

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The following shows estimates of when each billion milestone was or will be met:

Population 1 billion 2 billion 3 billion 4 billion 5 billion 6 billion 7 billion 8 billion 9 billion
Year 1804 1927 1960 1974 1987 1999 2011 2024 2042
Years until next billion 123 34 13 13 12 12 13 18

These numbers show that the world's population has tripled in 72 years, and doubled in 38 years up to the year 1999. Including some more estimates, the world population has been doubled or will double in the following years (with two different starting points). Note how, during the 2nd millennium, each doubling has taken roughly half as long as the previous doubling.

Population 250 million 500 million 1 billion 2 billion 4 billion 8 billion
Year AD 950 1600 1804 1927 1974 2024
Years until next doubling 650 204 123 47 50
Population 375 million 750 million 1.5 billion 3 billion 6 billion
Year 1420 1720 1875 1961 1999
Years until next doubling 300 155 86 38

Category:Population statistics