I'm curious about one thing. Like the article alludes to there is currently an extremely strong connection between fertility and low education, low income, and high religiosity. This [1] is a list of nations by <i>net</i> natural population growth. So births - deaths. From the top (according to UN predictions for 2015-2020): Uganda, Angola, Mali, Somalia, Tanzania, etc. From the bottom on nations that are collectively dying: Bulgaria, Latvia, Ukraine, Hungary, Lithuana, Romania, Portugal, Greece, Japan, Germany, Italy, etc.<p>One of the facts is that 137,000 people/day have been escaping 'extreme poverty'. But what happens when the part of society that is living in economically stable and educated households is not even reproducing to the point of replacing itself, while those living in low education and low income households are massively reproducing?<p>The natural response here is that if we can just improve the situation of places such as Africa then this situation ought resolve itself with birth rates starting to become comparable thus preventing a condemnation of the next generation. There are two problems with this view. The first is that this relies exclusively on a correlation which to date has proved less than predictive of African fertility levels. More importantly this effect is not just international but also intranational. Those who earn the most in the US have the fewest children with households earning less than $10,000 having a 50% greater fertility rate than those earning $200,000+. [2] It seems we're creating a society where each new birth is more and more likely to come into this world in some of the least appropriate households.<p>[1] - <a href="https://en.wikipedia.org/wiki/List_of_countries_by_natural_increase" rel="nofollow">https://en.wikipedia.org/wiki/List_of_countries_by_natural_i...</a><p>[2a] - <a href="https://www.statista.com/statistics/241530/birth-rate-by-family-income-in-the-us/" rel="nofollow">https://www.statista.com/statistics/241530/birth-rate-by-fam...</a><p>[2b] - <a href="https://www.census.gov/topics/health/fertility.html" rel="nofollow">https://www.census.gov/topics/health/fertility.html</a> (the link to statista presents this data in a cleaner format - also adding this as just a more reliable source)