Al Gore Used Michael Mann's Global Warming Hockey Stick Chart in "An Inconvenient Truth"

See Hockey Stick Hokum, a July 14, 2006 Editorial at the Wall Street Journal at http://online.wsj.com/article/SB115283824428306460.html?mod=opinion_main_review_and_outlooks

It includes:
■ The assertion "that the 1990s were the 'warmest decade in a millennium' and that 1998 was the warmest year in the last 1,000. … is often recited without qualification, and even without giving a source for the 'fact'."
■ "The claim originates from a 1999 paper by paleoclimatologist Michael Mann. Prior to Mr. Mann's work, the accepted view, as embodied in the U.N.'s 1990 report from the Intergovernmental Panel on Climate Change (IPCC), was that the world had undergone a warming period in the Middle Ages, followed by a mid-millennium cold spell and a subsequent warming period -- the current one. That consensus, as shown in the first of the two IPCC-provided graphs nearby, held that the Medieval warm period was considerably warmer than the present day."
■ "Mr. Mann's 1999 paper eliminated the Medieval warm period from the history books, with the result being the bottom graph you see here. It's a man-made global-warming evangelist's dream, with a nice, steady temperature oscillation that persists for centuries followed by a dramatic climb over the past century. In 2001, the IPCC replaced the first graph with the second in its third report on climate change, and since then it has cropped up all over the place."
■ "Al Gore uses it in his movie."
■ "In 2003, two Canadians, Ross McKitrick and Steven McIntyre, published an article in a peer-reviewed journal showing that Mr. Mann's methodology could produce hockey sticks from even random, trendless data."
■ "three researchers -- Edward J. Wegman of George Mason University, David W. Scott of Rice University and Yasmin H. Said of Johns Hopkins University -- are not climatologists; they're statisticians. Their task was to look at Mr. Mann's methods from a statistical perspective and assess their validity. Their conclusion is that Mr. Mann's papers are plagued by basic statistical errors that call his conclusions into doubt."
■ "Mr. Wegman brings to bear a technique called social-network analysis to examine the community of climate researchers. His conclusion is that the coterie of most frequently published climatologists is so insular and close-knit that no effective independent review of the work of Mr. Mann is likely. 'As analyzed in our social network,' Mr. Wegman writes, 'there is a tightly knit group of individuals who passionately believe in their thesis.' He continues: 'However, our perception is that this group has a self-reinforcing feedback mechanism and, moreover, the work has been sufficiently politicized that they can hardly reassess their public positions without losing credibility'."
■ "published climatologists is so insular and close-knit that no effective independent review of the work of Mr. Mann is likely. 'As analyzed in our social network,' Mr. Wegman writes, 'there is a tightly knit group of individuals who passionately believe in their thesis.' He continues: 'However, our perception is that this group has a self-reinforcing feedback mechanism and, moreover, the work has been sufficiently politicized that they can hardly reassess their public positions without losing credibility'."
■ "climate research often more closely resembles a mutual-admiration society than a competitive and open-minded search for scientific knowledge. …the dismissive reaction of the climate-research establishment to the McIntyre-McKitrick critique of the hockey stick confirms that impression."