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1945BestYear t1_j4woyaj wrote

That's why I stated that assumption, I admit that it's napkin maths.

Although I don't really think birth rates to be that widely distributed anymore. Most of Asia and the Middle East is down to similar levels as Europe and the Americas at around 2 births per woman, many of those countries spent the last 70 years bringing child mortality and the birth rate down (Bangladesh for example is precisely 2.00 births per woman). Sub-Saharan Africa's birth rate is higher, most of the population growth in the next century will be there, but right now Africa's share of the global population isn't that large at 1.2 billion.

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