Population Projections — Really, I’m Not Lying

With the proliferation of the Internet, most of the data and other information regarding population are now conveniently found on the web. So now when someone emails me, as often happens, that my population numbers are a crock, I can point them to the US Census Bureau’s on-line estimate of world population through 2050.

There are two interesting things to note about these figures. The first, of course, is that the mid-year population projection for 2050 is 9.3 billion people — far lower than some of the irresponsibly high numbers which are often tossed around as if they are inevitable.

Second, the actual world population total could be far lower. Consider, for example, that from 1986 to 1996, the average annual growth rate declined by .28 percent — close to a .03 percent decline per year. In fact since 1970 the world has experienced an average .255 percent decline each year. But for its projections, the Census Bureau assumes only a .02 percent drop each year.

Of course, on the other hand even small decreases in this rate could drive the population in 2050 far higher, but so far all of the available evidence is consistent with a continuing fall in worldwide fertility rates and thus population growth rates.

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