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Asking for _proof_ of global warming, or
_proof_ of the opposite, is alas not the
whole story.
There are lots of problems (including at
present the global warming question) where
the methods of proof we use in the physics
lab are not applicable. There are a number
of plausible outcomes, and no real proof that
any of them are impossible.
Situations like this are not the least bit
uncommon. Suppose you are a manager and you
want to hire a researcher or two. Can you
_prove_ that they are going to work out?
Invent something wonderful? Win a prize?