"The National Science Foundation has closed its investigation into Pennsylvania State University climatologist Michael Mann after finding no evidence of scientific misconduct related to his research.
It is the latest in a string of investigations to exonerate scientists involved in the so-called "Climategate" email scandal.
Mann was a central figure in the fracas, where a sampling of correspondence from climate scientists purloined from a computer server at the University of East Anglia in Britain supposedly showed climate scientists colluding to fabricate data and smear critics.
But a successive series of investigations and inquiries since the emails were released in 2009 have exonerated the scientists. The final conclusion from the NSF's Office of Inspector General is no different [PDF; enter Case No. A09120086]."
Douglas Fischer reports for The Daily Climate August 22, 2011.