The argument for doing something about climate change is, in my opinion largely based on "appeal to authority". In other words, if climate scientists say something is so, then it must be so.
That's why Climategate was so damaging to the warmenist cause. The credibility and therefore the authority of the main IPCC scientists was called into question. Without that credibility, the warmenists main argument was damaged and public support for doing something disintegrated.
The National Research Council was funded by Congress to study climate change and has now produced 3 reports totalling over 800 pages. I've scanned the first 100 pages and it looks to be nearly a complete regurgitation of the IPCC's last report (AR4), except that at the end of many sections the primary conclusion was that new bureaucracies and scientific organizations should be created to continue studying climate change.
How clever! Since the IPCC's credibility was damaged, why not take more or less the same material and have some scientists with reputation intact spout the same old alarmist stuff. Now the warmenists can appeal to authority again and march forward to world domination or whatever their goal is.
The credibility of the IPCC is dead - long live the credibility of the National Research Council!