Population Growth Still Isn't a Problem. Anti-Immigrant Groups Still Think It Is.

When Stanford University biologist Paul Ehrlich published The Population Bomb in 1968, he predicted that the 1970s would see an unavoidable period of widespread famine and death. That decade—and many since—have proven Ehrlich wrong. But that didn't stop him from warning of another impending catastrophe in a Sunday 60 Minutes appearance, claiming that "the next few decades will be the end of the kind of civilization we're used to."

That line has long been popular among the environmentalist left, despite all evidence to the contrary. Anti-immigrant groups and politicians keep...