The National Academy of Sciences consists of 1800 of the nation's top scientists. They are elected by their peers. Few of them receive funding for global warming.
The institution is over a hundred years old, and is the closest thing we've got to a Supreme Court of science.
Their official position is that global warming is real, and mostly caused by us. Why would anyone believe a few skeptics, instead of their position, which is well documented, and based on the work of thousands of independent scientists?
Here is their official position (the brochure requires Acrobat Reader, free download at
http://www.adobe.com/products/acrobat/readstep2.html)
http://dels.nas.edu/globalchange/
http://dels.nas.edu/dels/rpt_briefs/climate_change_2008_final.pdf
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