That's right, but note that the replacement rate depends on mortality rates and any gender-bias for either birth or mortality. Generally birth rates below 2.1 a

That's right, but note that the replacement rate depends on mortality rates and any gender-bias for either birth or mortality. Generally birth rates below 2.1 are consider "sub-replacement", but it can be much higher in some locales (due to disease, war, etc). Here are some per-continent population projections: https://commons.wikimedia.org/wiki/File:World_population_(UN).svg https://commons.wikimedia.org/wiki/File:World_population_(UN... (Interestingly, the above chart was created about 10 years ago; I do wonder how accurate it's been.)