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There will never be a consensus on this issue since there's no way to prove (or disprove) that humans are causing global warming, which is the real question. Politicians can't campaign against nature, so the issue is intentionally misrepresented. If you can't prove people are causing it, it's in the same category as the sun burning out and thus not worth discussing.
Greenhouse gas is yet another buzz word that is used to generate an emotional response. Water is a stronger greenhouse gas than CO2, but you can't win votes by speaking out against water, so you never hear about it.
One of the producers of "An Inconvenient Truth" recently said in an interview that, paraphrasing here, 'The movie is based on science, and you can't disagree with science'. I think that's pretty much all you need to know about that movie.
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