Quote:
Originally Posted by Vman455
our growth rate having fallen by nearly half since the 1960s.
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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.