We are at 7.7 billion now you expect the rest of the world to become affluent and educated enough for population to stop increasing by 12? Good luck with that. In any case I am not sure the world could sustain even that increase. Then we could cure cancer and then...
Until the worlds population increase which is ongoing exponentially is addressed politically (which would happen in a cold day in hell) anything we do is pissing in the wind. Young people ball is in your court.