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grrr... ok, simple concept, there is no such thing as scientific proof, therefore, debate will always continue for any scientific hypothesis/theory. heck, the most tested theory on the planet, relativity, is still being debated! furthermore, this particular debate is hardly over, in spite of what many seem to claim. more and more scientists are coming forward as "denialists" w.r.t. the climate every day. if anything, the debate is only heating up.
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Roughly 90% of the scientific comunity believe that the global warming phenomenon is man man made, roughly 10% believe that the temperature changes are a natural phenomenon, that is quite sufficient to say that the debat whether or not
it exists or not is nolonger in the foreground.
The Republicans, traditionally quite content to believe there was no such thing, are quite keen on some of Arnold's success in energy management in California rubbing off on them.