Birth rate myths
Posted by talos in fertility
...three deeply misleading assumptions about demographic trends have become lodged in the public mind. The first is that mass migration into Europe, legal and illegal, combined with an eroding native population base, is transforming the ethnic, cultural, and religious identity of the continent. The second assumption, which is related to the first, is that Europe’s native population is in steady and serious decline from a falling birthrate, and that the aging population will place intolerable demands on governments to maintain public pension and health systems. The third is that population growth in the developing world will continue at a high rate. Allowing for the uncertainty of all population projections, the most recent data indicate that all of these assumptions are highly questionable and that they are not a reliable basis for serious policy decisions...
From The World's New Numbers by Martin Walker. See also this [in Greek, first part] for pretty much the same points.
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