Total fertility rate for zero population growth is 2.1. Taiwan is 1.0 now. That's right, they are on pace to have HALF as many births compared with deaths. Each generation half the size of the one before.
And VERY few developed countries have a positive birth rate. Very few people seem to know this story. Total world population is still growing, but ONLY in the poorest nations. Even in the third world, total fertility is falling rapidly.
There is no question that there was a period of runaway population growth in the last century. But an inflection point has been passed and humanity is soon going to have dire problems with population IMplosion.