Climate-change skeptics closely examined the hundreds of facts and statements in 2007 U.N. report and found some mistakes, but the consensus was that the errors were minor and did not undermine the report's conclusions.
Current surveys (see: "Scientific opinion on climate change," Wikipedia) indicate that roughly 97 percent of climate scientists agree that global warming is occurring, with human activity a significant factor. Many scientific organizations now explicitly use the term "consensus" in their statements about climate change. Read the full report here.
Source: Cleveland.com.