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There is an open letter written by sceptics to the US Congress here:
They link to a rather long article the prudent path, refuting the "alarmist's claims that climate change poses an immediate danger to humanity".
Looking for a comment on this article, I found this (which is unrelated to the letter per se, but addresses some of the common claims made by sceptics):
Is this material too controversial to be mentioned on the Azimuth project?
I lack both the necessary background knowledge and the time for a thorough critical assessment, so I'd have to include both sources mostly uncommented on the Azimuth project. Assuming that the answer to question 1 is "no", would that be a problem?