Al Gore told us that he knows for sure!
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Some politicians are going as far as advocating that it be made a crime for anyone to question the politically correct notion of global warming. I won't accuse Al Gore of that because I have not heard of him advocating that -- yet, at least. The global warming scare is part of a new religious inquisition. Four hundred years ago Galileo was persecuted for, among other things, mentioning sunspots. Today, scientists again may be persecuted for mentioning things such as sunspots.