Aforementioned: aphorisms and questions for 2015
A worldwide habit of 1 child per fertile woman will be the grand legacy of our generation for those that follow. 
Subtracting continued lengthening of life expectancy, a habit of two children per fertile woman would mean a replacement of about 75% of human population per generation. If we had started sooner this would likely have wrought miracles. It's too late. Now we need to make the more draconian sacrifice of one child per family. To judge from the picture above it's not so draconian.
Subtracting continued lengthening of life expectancy, a habit of two children per fertile woman would mean a replacement of about 75% of human population per generation. If we had started sooner this would likely have wrought miracles. It's too late. Now we need to make the more draconian sacrifice of one child per family. To judge from the picture above it's not so draconian.
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