We are entering an unanticipated reality—an era of slow population growth and, increasingly, demographic decline that will shape our future in profound and unpredictable ways. Globally, last year’s total population growth was the smallest in a half-century, and by 2050, some 61 countries are expected to see population declines while the world’s population is due to peak sometime later this century.
This kind of long-term global demographic stagnation has not been seen since the Middle Ages. World population has been growing for centuries, but the last century has dwarfed previous rises. About 75 percent of the world’s population growth has occurred in the last hundred years, more than 50 percent since 1970. But now, population growth rates are dropping, especially in more developed nations, according to the United Nations (all subsequent references to UN research in this essay are drawn from these data).
It’s not a matter of if but when global populations will start to decline. Under the UN’s medium variant projection, the world’s population will peak in 2086, while under the low variant, the peak will occur in 2053, and by 2100, the population will be about a billion below today’s level. Demographer Wolfgang Lutz and colleagues project a global population of between 8.8 and 9.0 billion by 2050 falling to between 8.2 and 8.7 billion by 2100. The projected declines are concentrated in countries with high fertility rates, especially in sub-Saharan Africa. In the process, we will inhabit a rapidly aging planet. In 1970, the median world age was 21.5 years. By 2020, it had increased to 30.9 years, and the UN projects that it will be 41.9 years in 2100.
We are well past the time when we need to concern ourselves with Paul Ehrlich’s long-standing prophecy that humanity will “breed ourselves to extinction.” On the contrary, we need to worry about the potential ill-effects of depopulation, including a declining workforce, torpid economic growth, and brewing generational conflict between a generally prosperous older generation and their more hard-pressed successors. The preponderance of low fertility in wealthier countries also presages a growing conflict between the child-poor wealthy countries and the child-rich poor countries.
Abortion links: choose life.