The less intelligent and civilized of the human race continue to reproduce as a matter of course with either no, or at most very little, thought to the future overpopulation and resulting famine or anything else. They go on, generation after generation, reproducing merely because it is their nature to do so. The more intelligent and civilized members of human society, on the other hand, are using birth-control methods in their effort to control population growth and, so, are slowly breeding themselves out of existence or at least into what is already a serious minority.