 World Population 10,000 BC - 2050 AD: From 10,000 BC through the early 1800s, the world population stayed below 1 billion globally. By the 20th Century, population totals soared, more than doubling between 1920 and 1980 from fewer than 2 billion people to almost 4.5 billion in 60 years.
World Population 1988 - 2050 AD: The U.S. Census Bureau’s International Data Base shows that world population increased by more than 50% in the 32 years since the Day of Five Billion in 1987.
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