Roger Pielke Jr's latest post is very important. It concerns IPCC lead author Chris Field, who is a professor at Stanford and head of Working Group II. RP Jr accuses him of misleading the US Congress over the IPCC report:
What Field says the IPCC says is blantantly wrong, often 180 degrees wrong. It is one thing to disagree about scientific questions, but it is altogether different to fundamentally misrepresent an IPCC report to the US Congress. Below are five instances in which Field's testimony today completely and unambiguously misrepresented IPCC findings to the Senate. Field's testimony is here in PDF.
[Corrected misdirection of Pielke's comments]