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Complainant Name:
Mr Michael Mann

Clauses Noted: 1

Publication: The Sunday Telegraph


Mr Michael Mann of Penn State University complained that the newspaper had inaccurately suggested that he had engaged in deliberate scientific misconduct and dishonesty in relation to the production of the "hockey stick" graph of historic climate change patterns.


The complaint was resolved when the newspaper agreed to publish the following letter and footnote:

Dear Sir:

Christopher Booker has a clear history of biased reporting on climate change, including multiple misunderstandings of the current state of the science. He has specifically made unfounded attacks against my own research on the reconstruction of past climate variability. Booker ignores the endorsement of the U.S. National Academy of Sciences of our original findings (see "Academy Affirms Hockey Stick Graph", Nature, 29 Jan 2006) and independent research teams have subsequently extended our findings, concluding that global temperatures in recent decades are likely to have been unusual for at least the past 1200 years.

However, the focus on the "Hockey Stick" is a distraction. Paleoclimate data provide just one of numerous lines of evidence that the significant climate changes taking place are very likely due to human-caused increases in atmospheric greenhouse gas concentrations. For readers interested in the actual science, there are many accessible, expert sources of information, including the website "" and recent books including my "Dire Predictions: Understanding Global Warming" and "Climate Change: Picturing the Science" by Schmidt and Wolfe.

Michael E. Mann

Professor, Dept. of Meteorology and Director of the Earth System Science Center, Penn State University

Professor Mann has asked us to make clear that the article did not intend to suggest any scientific wrongdoing and we are happy to do so.

Report: 79

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