NEW YORK, July 11 (UPI) -- The United Nations established July 11 as World Population Day in 1989 to raise awareness about global population issues. July 11 was chosen because it was the approximate day in 1987 that the world's population reached five billion, inspiring Five Billion Day to be observed that year.
Today's world population includes 1.8 billion young people, the largest number of youth in history, and the focus of the 2014 World Population Day observing. "Investing in young people" is this year's campaign theme.