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Excellent summation Dave.
It is already too late.
Whatever the cause we can expect the planet to become uninhabitable in a century or two.
If man made we are doomed cause you won't change human behaviour.
If we stopped human input today the problem is the damage is already done...so I would plan how to exist on a planet with average temps so high growing food in the open is no longer possible..
I formed my opinion from much reading and reflect only the views of folk who appear to know what they are talking about.
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