We humans tend to think of such long-term thinking as silly, frivolous mind exercises for the elite educated. I would applaud such thinking. But western civilization has trouble with seven generations, let alone seven million generations.
On Fri, Dec 16, 2022 at 3:21 PM David Eric Smith <desm...@santafe.edu> wrote: > I doubt the answer would be interesting, but one could give it as a Fermi > problem to an undergraduate geology class (who don’t do Fermi problems; but > the physicists won’t know any geology). > ... > How much, for how long, can we extract, until the inner core grows enough > that the geodynamo shuts down, ending the Earth’s magnetic field, the van > Allen belts etc., and exposing the atmosphere directly to spalling by > protons from the solar wind? >
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