In the current century, the past decade as of 2012, most advanced countries have increased fertility. This is completely expected from the viewpoint of evolutionary psychology, with drastic environmental changes causing selection of behavioral traits that increase reproduction.
There is an associated footnote but the
link it goes to is dead. All I can tell from a bit of search is that it began with
13 Oct 2012 – Forecasters say they expect the world's population to reach 10bn by the year 2050 - but could the figure be 36bn?
Did the BBC yank this article from their site?
Also posted at Dreamwidth, where there are comment(s); comment here or there.