No demographer that I know of believes that our numbers will ever double again. In fact, not even the demographers at the UNFPA’s sister agency, the U.N. Population Division, believe it. Their favored graph looks like this:
UN Population Division Medium Variant Projection
This projection shows the world’s population peaking at 10 billion by the last decades of the 21st century, not steadily climbing to 13 billion and beyond. LifeNews
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