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This Woman Will Decide Which Babies Are Born
(www.wired.com)
This is a most excellent place for technology news and articles.
Replacement rate is 2.1 children per woman, and there are about 100 countries under that rate. Yes, their populations are still growing, but much of that is through extension of life expectancy and immigration (which requires a higher birth rate somewhere else, lest that other places start seeing shrinking population).
It's not an immediate crisis, but it is turning into a problem that should be addressed soon.