Mr Fournier's comments were foolish indeed. As if it's logically possible to prove something doesn't exist. Lack of proof isn't
an absolute assurance. Far from it, in fact. I'd be willing to
wager that there is actually more physical proof for the
existence of ghosts than there is for global warming. Note, I
didn't deny that global warming exists, just that there is
probably more physical proof for the existence of ghosts, if
one cares to look without prejudice.