Summary Throughout history, disease has been the great delimiter of human population. Once we discovered our invisible enemies under the scope, we began to slaughter the poor fellas en masse, and this enabled us to live longer. Our population exploded exponentially, but only until recently. Suddenly, we stopped having babies. The worldly wisdom is that the contemporary delimiter of population is the education of women and that it is a positive development for our species. The demographers would like you to think that we are not having babies primarily because women are not as stupid as their grandmothers. Actually, the education of women has little to do with why population is coming to a standstill. The reason we are not having babies is for the same reason cows, bacteria, and dune plants stop having babies. Man has entered a regime of density- dependent birth rates. We will expand no more. We are scheduled to attain ZPG soon. The most formidable enemies of mankind today are not climate change, nuclear weapons, or diseases. We can perhaps do something about these agents if we put our minds to it. We cannot do anything about urbanization. It is density-dependent birth rates which bring Man's frantic demographic expansion to an end. Our global population pyramid overturns, and we complete the last stretch of the sigmoidal demographic curve. Of the three possible population trends that await us, Man will follow the route that Neanderthal and all other now defunct species followed. We will follow the one that leads to extinction. That's the fate dear Mother Nature planned for us.