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Also, the rate of population growth is slowing such that the UN projects a peak population of 9.22 billion, occurring in 2075.

http://www.un.org/esa/population/publications/longrange2/Wor...

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Population increases and declines are not evenly spread across the world. The migration crisis leading to the rise of global populism seems to be set to happen again.

http://www.reuters.com/article/us-europe-migrants-africa-ana...

Yes, but the UN projection takes that into account. Not to imply that any projection is perfect, but they are working with a lot of historical data.

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