With a future of climate-induced migrations, we will likely face these problems anyway as people leave areas and never come back (or simply die) after "edge case" disasters strike.
http://www.apda.jp/pdf/e_newsletter/enews_no60_en.pdf
"Furthermore although Africa’s total fertility rate (TFR) is falling if only moderately, it is still high, at around 5.0. This means that alongside promoting economic development in Africa, it will be prudent to strengthen support for expanding RH services there, including family planning. A source of concern for Africa’s fertility rates from now on, however, is that the reactivation by the Trump Administration ofthe Mexico City Policyis an obstacle to any such strengthening. This decision taken by the U.S. will have a major impact on Africa’s population issues, and policies will be needed to counter that."
Don't just assume this. https://www.youtube.com/watch?v=usdJgEwMinM