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http://dieoff.org/page8.htm
"The full list includes a majority of the Nobel laureates in the sciences"
Just throwing this out there. I hate to appeal to knowledge based on authority (these guys must know what they're talking about) as it's something that could never possibly convince me.b
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The knowledge of such a letter is not without value though. It's just one indication of what you'll find as you look further into the climate change issue: that the scientific consensus is now
very strong that we are in a period of climate change that is, to a large extent, human caused. As wacki mentioned, there are very few qualified experts who dismiss what the consensus is telling us. The tiny number who do are typically financially backed by big oil or other such corporate interests. Now, you should of course do your own investigating and develop some understanding of the science involved, but without a major time investment you'll still need to rely to some extent on expert opinion. Which experts does it make sense to listen to? The ones who are paid to speak for big business or the ones doing legitimate, peer reviewed research in respected journals? Again, you can find a great deal of quality information from climate scientists on
RealClimate. They include there lots of posts and articles on the topics the "skeptics" have challenged.