A prominent skeptical climate scientist in Canada named Tim Ball accused Mann of fraud in generating the Hockey Stick graph. The famous quote, from a February 2011 interview of Ball, was “Michael Mann should be in the State Pen, not Penn State.” In March 2011, Mann sued Ball for libel, focusing on that quote, in the Supreme Court of British Columbia in Vancouver. Here is a copy of the Complaint. (Note: In British Columbia, the Supreme Court is not the highest appellate court, but rather the trial-level court for larger cases.) The case then essentially disappeared into limbo for eight plus years. But on Friday, August 23, the British Columbia court dismissed Mann’s claim with prejudice, and also awarded court costs to Ball. As far as I can determine, this was an oral ruling, and no written judgment nor transcript of the ruling yet exists. I have asked Ball to send them along as soon as they exist.
The story of Ball’s vindication, and of Mann’s shame, is a somewhat long one, and turns on Mann’s flat refusal to share publicly the data and methodology by which he constructed the Hockey Stick graph. In about 2003 a very talented Canadian mathematician named Steve McIntyre began an effort to replicate the Mann/Bradley/Hughes work. McIntyre started with a request to Mann to provide the underlying data and methodologies (computer programming) that generated the graph. To his surprise, McIntyre was met not with prompt compliance (which would be the sine qua non of actual science) but rather with hostility and evasion. McIntyre started a blog called Climate Audit and began writing lengthy posts about his extensive and unsuccessful efforts to reconstruct the Hockey Stick. Although McIntyre never completely succeeded in perfectly reconstructing the Hockey Stick, over time he gradually established that Mann et al. had adopted a complex methodology that selectively emphasized certain temperature proxies over others in order to reverse-engineer the "shaft" of the stick to get a pre-determined desired outcome.
