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The UN just doubled its estimate for how many Africans there will be in 2100. In 2004 they estimated there would be about 2 billion -- now they're saying 4 billion with who knows how many more to come. Can the world sustain this population growth?: https://alfinnextlevel.wordpress.com/2015/07/12/can-earth-support-100-billion-humans-comfortably/ A big issue is that contraceptive use is very limited or hard to get in sub-Saharan African nations. There is hope that increasing education and access to condoms and the like will help stem this flow.: http://www.unz.com/isteve/u-n-population-projection-for-africa-doubled-from-2004-to-2015/ http://www.humanosphere.org/basics/2015/10/oped-africas-challenging-demographic-future/ ....if something isnt' done though -- there is a real risk that the global population will be too much for global resources and that those Africans who can't find work and/or a way to feed themselves will head north to Europe as refugees hoping to get in and on welfare and on the underground economy.... http://www.unz.com/isteve/why-africas-fertility-rate-threatens-the-globe/ http://www.unz.com/isteve/the-fundamental-reason-theres-a-migrant-crisis-in-the-mediterranean/ Mali and Niger -- 2 nations in the Sahel and Sahara deserts -- are expected to have hundreds of MILLIONS of people in the coming few decades.... If this isn't checked soon we will see a population crisis and humanitarian disaster the world has never seen as people die of starvation and disease and/or attempt to come to the west seeking employment.