The chair of the IPCC has made the claim that the IPCC reports are based on peer-reviewed scientific papers. An audit found that 30% of the references cited in the 2007 report were not, in fact, peer-reviewed at all. Half the chapters in the report were so thin on actual references that the audit gave them an "F" - less than 60% of the references in that chapter were actual peer-reviewed science.
Yes, the person who ran the audit is promoting her forthcoming book on the site. Fortunately the audit results and methodology are available. The criteria for peer-reviewed status were very simple - the article simply had to be from a journal, with no judgements made on the quality of that journal.