The world's population will officially hit seven billion on Monday, October 31 — at least according to the State of World Population 2011, a report published by the United Nations Population Fund (UNFPA).
According to Agence France-Presse, population growth is accelerating. The global population is estimated to have reached a billion people by the year 1800, before hitting 2 billion in 1927. The 3 billion mark was reached by 1959, four billion by 1974, five billion by 1987, and six billion by 1999.
The world adds 80 million people to its population every year — about the same number of people who live in Germany or Ethiopia.
Experts say the world's population could reach 10 billion by 2050.
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