In November 2009 , hackers obtained a large number of emails exchanged among researchers at the Climatic Research Unit of the University of East Anglia and with other scientists , including Mann . The release of their correspondence on the Internet sparked the Climatic Research Unit email controversy , commonly known as ' Climategate ' , in which extracts from emails were publicized to raise accusations against the scientists . A series of investigations cleared the scientists of wrongdoing . Detailed analysis by the United States Environmental Protection Agency ( EPA ) found that the critics made unsupported accusations of falsification and manipulation or destruction of data and were commonly mistaken about the scientific issues
Climatic Research Unit email controversy
Climatic Research Unit email controversy
Michael E. Mann