The IPCC is a flawed institution of th corrupt UN. Their work on AGW involves a lot of bias and obfuscation. Here is a paper describing the problems with the IPCC process, which is certainly not scientific. I like the prt where the IPCC sends a letter to a reviewer telling him to quit requesting the scientific papers that support the work he is reviewing, and to quit challenging the conclusions, or he will be dropped as a reviewer. The IPCC is obviously a fascist organization.One problem I have is reconstructing past temperature from pine tree rings. I raise pine trees, and can show you many places where two adjacent trees that are the same age vary in diameter from 8 inches to 16 inches. How could someone take one of those trees a few hundred years from now, and based on the width of the rings determine what the temperature is now? The dishonesty of the IPCC is revealed when it acknowledged that they shifted from tree ring guesses to actual temperature measurements, even though current tree ring data do not correspond to current temperatures.

http://homepages.tesco.net/~kate-and-david/2007/Holland(2007).pdf