Anyone who has traveled from coast to coast in the United States and seen the vast empty spaces should know that America is not overpopulated. In fact, the entire population of the world could live in the state of Texas, in single-family dwellings with front and back yards. Fertility rates are falling everywhere. The world’s population will never again double. If current trends continue, world population will peak by the middle of this century and then begin demographic freefall. Our long-term problem is not too many children, but too few children. Having another child will help offset the coming population implosion.