Human Population Through Time

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It took 200,000 years for Earth’s population to reach 1 Billion(by 1800's), and only 200 years thereafter to reach 7 Billion.
A small video from American Museum Of Natural History, that shows how the human population grew over time and a projection about the future of population.

Some facts about the present world population.

An estimate of how population of various cities has surged from 1950 and is likely to touch by 2035