Does the IPCC Prefer Grey Literature to Peer-Reviewed?

Economist Richard Tol has written a series of guest posts over at Roger Pielke Jr.’s blog outlining his concerns regarding the Working Group 3 portion of the 2007 Intergovernmental Panel on Climate Change (IPCC) report.

Many of these concerns involve the use of non-peer-reviewed literature to neutralize peer-reviewed research findings the IPCC writers apparently preferred to disregard.