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@the-smiling-buddha
If the IPCC worst case secenario is 2ft rise in sea levels how to you make out that a 20ft rise is credible..? a worst case scenario means the worst case. So either the scenario is wrong or Al Gore is wrong, there ain't no third way, sunshine.
Al Gore then went on to be found out having $30,000 electricity bills in his southern mansion, which he offset by buying carbon credits from his own company. That I believe entitles me to question his credibility, because if you are going to preach, you got to stand by what you preach, and if you follow his example, then if you are rich you just go out and buy yourself a green conscience.
As far as I understand it, it looks as if gloabl temperatures are rising, man most likely has made a contribution to this, however climate change is cyclical (for example the ice ages) and there are other factors that may contribute, the orbit of the earth, sun spot activity etc. If you read the IPCC report or at least the summary on wikipedia no one no where can tell you in which proportions each of these factors effect the climate. Therefore my initial question about 'how do we know' is a quite a reasonable question.
However I asked the question not because I dispute global warming but because I heard on a radio show that said that if you publicly question global warming these days it is akin to making a racist or sexist comment,so I was kind of curious what the reaction might be.