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Well there is proof but its that type of proof you get from an experiment that takes 1000 years perhaps to get a conclusion. Of course, 1000 years haven't passed, so to claim anyone has the conclusive proof that the other is wrong is futile at best.
As for me, I err on the side of caution - the point is, if I dont have to waste resources, if I don't have to pollute, etc. then I don't do it. Its like the gun analogy - better to have and not need than to need and not have. Well its the same thing here - better to conserve/preserve and be wrong and have no such thing as global warming than to pollute and be wrong and have such a thing as global warming.
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