World Population Reached Six Billion
On this day · 12 October 1999
The UN crowned a single newborn in Sarajevo as humanity's six billionth member, marking a milestone reached in barely a dozen years.
On 12 October 1999, the United Nations Population Fund declared that humanity had reached six billion people, designating the date “The Day of Six Billion.” The number was symbolic rather than exact, but it gave the world a moment to reflect on a century of explosive growth.
To put a human face on the statistic, UN Secretary-General Kofi Annan travelled to Sarajevo, where he held Adnan Mević, a 3.5-kilogram boy born that morning in the Koševo hospital. The child was proclaimed the symbolic six billionth person alive on Earth.
Reaching six billion took only about twelve years after the world passed five billion in 1987.
Demographers stress the date was an estimate; later analyses suggested the true crossing may have come months earlier, around June 1999. Even so, the milestone underscored how fast the planet’s population had climbed, having roughly doubled since 1960 within a single human lifetime.
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