It took thousands of years for the global population to hit 5 billion, which happened in 1987. Some 32 years later, we're closing in on 8 billion. This explosive growth concerns leaders at the United Nations, who created World Population Day in 1989 to raise awareness about the problems caused by overpopulation. The holiday is observed annually on July 11. The planet's population today is 7.7 billion. How mind-bogglingly huge is that number? If you started now and ticked off 7.7 billion seconds ...
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Added July 11, 2019