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Population in the world is currently (2019-2020) growing at a rate of around 1.08% per year (down from 1.10% in 2018, 1.12% in 2017 and 1.14% in 2016). The current average population increase is estimated at 82 million people per year.
Lets assume exponential growth and a doubling time of about 70 years because of a 1% growth rate.
Doubling Time = 70 / (%Growth per unit time)
8 billion 2020
16 billion 2090
32 billion 2160