The process picked up momentum late last year, after hackers leaked thousands of e-mails from a top British research facility showing that some of the world’s most influential climatologists had been trying to disguise flaws in their work, blocking scrutiny, and plotting together to enforce what amounts to a party line on climate change. More recently, the United Nations’ respected advisory group, the Intergovernmental Panel on Climate Change (IPCC), has been deeply embarrassed by the revelation that some alarming predictions contained in an influential report that it released in 2007 have little or no scientific basis.