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Global Warming: Russian analysts accuse Britain's Meteorological Office of cherry-picking Russian temperature data to "hide the decline" in global temperatures. Is Copenhagen rooted in a single tree in Siberia? Michael Mann, a Penn State meteorologist, wrote in Friday's Washington Post that "stolen" e-mails from the University of East Anglia's Climate Research Unit still don't alter the evidence for climate change. Mann, a creator of the discredited hockey-stick graph used in reports from the U.N.'s Intergovernmental Panel on Climate Change to show man-made warming, attacks climate skeptics, including former Alaska Gov. Sarah Palin, saying they "confuse the public." Chutzpah has been...

Beginning in 2003, I worked with Stephen McIntyre to replicate a famous result in paleoclimatology known as the Hockey Stick graph. Developed by a U.S. climatologist named Michael Mann... ...Steve and I showed that the mathematics behind the Mann Hockey Stick were badly flawed, such that its shape was determined by suspect bristlecone tree ring data. ...a series of other studies published since 1998 had similar shapes, thus providing support for the view that the late 20th century is unusually warm. The IPCC also made this argument in its 2007 report. But the second expert panel, led by statistician Edward...

GRANTS PASS, Ore. - Using fire scars on nearly 5,000 tree stumps dating back 450 years, scientists have found that extended periods of major wildfires in the West occurred when the North Atlantic Ocean was going through periodic warming. With the North Atlantic at the start of a recurring warming period that typically lasts 20 to 60 years, the West could be in for an extended period of multiple fires on the scale of those seen in 2002 and 2006, said Thomas W. Swetnam. He's the director of the Laboratory of Tree Ring Research at the University of Arizona and...