It took 200,000 years for our population to reach 1 billion--and only 200 years to reach 7 billion
This Amazing Visualization Shows How We Got to 7 Billion People on Earth
Twisted Sifter - 7 Dec 2016 18:28
It took 200,000 years for our population to reach 1 billion--and only 200 years to reach 7 billion
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