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Old 07-12-2015, 09:29 PM   #10 (permalink)
IamIan
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Quote:
Originally Posted by Vman455 View Post
our growth rate having fallen by nearly half since the 1960s.
The actual replenishing reproductive rate has fallen by even more than that .. it's just 'concealed' a bit by the simultaneous increase (~30%) of average life expectancy.

-__% Average Replenishing Reproduction Rate + 30% Average Life Expectancy of those already alive = That -1/2 net growth rate you wrote about above.

That is effectively a very rapid (and fundamental) .. change in less than one average life time of the species ... and without any obvious major external driver causing it.
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