"We need to prepare, not for the consequences of a population boom, but a population bust. A child born this decade will probably reach middle age in a world where population growth has stalled, and may already have begun to shrink. "--Darrell Bricker and John Ibbitson, The Observer, 27 January 2019
"The basic claim that global population, now 7.5bn, will decline rapidly later this century after peaking at below 9bn — rather than the 11bn that is the UN’s central forecast." - "Market economics failed to topple Chinese communism, but perhaps the halving of its population by the end of the century will do the trick instead."
Why? "It can be summed up in one sentence. As societies urbanize, women become better educated (including about contraception) and more financially autonomous thanks to working outside the home, and this causes fertility rates to plummet, which is reinforced in most places by the weakening ties of family, clan and organized religion."