overpopulation

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It is orthodox ideology today that overpopulation is a problem. We regularly hear dire warnings about the dangers it poses. But the term overpopulation is never defined. Exactly what is it? How do we know if a country is overpopulated? If overpopulation exists, is there such a thing as underpopulation?

For decades people have been announcing that China is overpopulated, but no one has seemed overly concerned about the state of Maryland. Yet the population density (the number of people per square kilometre) in Maryland is much greater than in China. The United Kingdom also has a far higher population density than does China. Actually, the UK has a population density almost equal to that of overpopulated India. And Switzerland is more densely populated than Pakistan.

Clearly, some problems exist when it comes to defining our terms. If Maryland, the UK, and Switzerland have greater population densities than India, China, and Pakistan, then why are the latter considered overpopulated, but not the former?