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Low Fertility at the Turn of the Twenty-First Century
In the past few decades, demographic concerns have shifted from rapid population growth fueled by high fertility to concerns of population decline produced by very low, sub-replacement fertility levels. Once considered a problem unique to Europe or developed nations, concerns now center on the global spread of low fertility. Nearly half of the world's population now lives in countries with fertility at or below replacement levels. Further, by the mid-twenty-first century three of four countriesdoi:10.17615/k1zg-hp03 fatcat:hbsbai2darbilgwi4zaahb7ng4