I have read Cohen's book "How Many People Can the Earth Support?" and
I highly recommend it.
It is there that I understood the amazing narrowness of the constraint
on population growth rate on very long time scales.
Perhaps I took a different lesson from the book than was intended.
As for the four million years, that is based on very little. We are no
ordinary species. We could be gone in two hundred years or still be
hanging around in two billion. I suppose it will make little
difference to me but I much prefer the latter.
Thanks for the other readings.
mt
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