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There's no such thing as "world population problem", scientifically.
That's an idea pursued in 60's by elitist circles like Ehrlich and Club of Rome who preferred to keep their California mansions not "contaminated" by "human pest" from developing countries. I have a copy of Ehrlich "Population bomb" on a shelf here, that's his language.
"Population carrying capability" etc were just ideas to support this contempt towards less privileged.