Consider the following note that appears to have been sent by Mr. Jones to Mr. Mann in May 2008: "Mike, Can you delete any emails you may have had with Keith re AR4? Keith will do likewise. . . . Can you also email Gene and get him to do the same?" AR4 is shorthand for the U.N.'s Intergovernmental Panel of Climate Change's (IPCC) Fourth Assessment Report, presented in 2007 as the consensus view on how bad man-made climate change has supposedly become.

In another email that seems to have been sent in September 2007 to Eugene Wahl of the National Oceanic and Atmospheric Administration's Paleoclimatology Program and to Caspar Ammann of the National Center for Atmospheric Research's Climate and Global Dynamics Division, Mr. Jones writes: "[T]ry and change the Received date! Don't give those skeptics something to amuse themselves with."

When deleting, doctoring or withholding information didn't work, Mr. Jones suggested an alternative in an August 2008 email to Gavin Schmidt of NASA's Goddard Institute for Space Studies, copied to Mr. Mann. "The FOI [Freedom of Information] line we're all using is this," he wrote. "IPCC is exempt from any countries FOI—the skeptics have been told this. Even though we . . . possibly hold relevant info the IPCC is not part of our remit (mission statement, aims etc) therefore we don't have an obligation to pass it on."

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