To me the evidence is not definite that man-made greenhouse gases cause global warming. There is evidence that greenhouse gases possibly or even probably cause global warming, but not that they are definitely responsible.
Unfortunately there has been an Orwellian type of approach by the global warming crowd. Like Al Gore claiming that "the debate is over" and anyone who opposes the global warming theory is either a right-wing conspirator or some kind of a nutcase. Instead of using science and reasoning to back up their position, the global warming people are trying to intimidate people into agreeing with them.
By the way I read that Al Gore's mega-mansion consumes 10 to 20 times as much energy as the average American home. That is really talking the talk but not walking the walk.
Even many of the scientists whose names are listed on publications supporting the global warming theory have disagreed with it. They have asked their names to be removed from global warming consensus statements and their requests have been refused.
For science to work properly there has to be a free and open exchange of ideas and opinions. Without freedom of expression and freedom of thought, science is dead. Kind of like the church putting Galileo on the rack for claiming the earth goes around the sun. That is what Al Gore and his global warming crowd are doing. The real tragedy would be if the global warming theory is true, and Gore and his crowd through their intimidation and propaganda tactics discredit the very theory they are trying to promote.
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