Michael Mann Vs. Michael Mann

Michael Mann grafted 20th century thermometer data on to his hockey stick, and then angrily denied that he did it.

“To construct the hockey-stick plot, Mann, Raymond S. Bradley of the University of Massachusetts Amherst and Malcolm K. Hughes of the University of Arizona analyzed paleoclimatic data sets such as those from tree rings, ice cores and coral, joining historical data with thermometer readings from the recent past.”

Behind the Hockey Stick – Scientific American

“No researchers in this field have ever, to our knowledge, “grafted the thermometer record onto” any reconstruction. It is somewhat disappointing to find this specious claim (which we usually find originating from industry-funded climate disinformation websites)”

RealClimate: Myth vs. Fact Regarding the “Hockey Stick”


“The earlier parts of the Northern Hemisphere temperature reconstruction shown here are derived from historical data, tree rings, and corals, while the later parts were directly measured.”

Wayback Machine

In a climategate email, Mann discussed disagreements about the temperature record with his colleagues.

Hockey stick graph took pride of place in IPCC report, despite doubts | Environment | The Guardian

Alleged CRU Emails – Searchable

CRU Emails

The Deleted Portion of the Briffa Reconstruction « Climate Audit

Briffa’s graph was similar to the NCAR graph from 1974.

21 Jul 1974, 13 – The Des Moines Register at Newspapers.com

It was also similar to the National Academy Of Sciences graph from 1975.

March 1, 1975 | Science News

 Science News, March 1, 1975

U.S. and Soviet Press Studies of a Colder Arctic – The New York Times

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3 Responses to Michael Mann Vs. Michael Mann

  1. conrad ziefle says:

    Did he use the actual historical data, or tampered data? Did he use all of the historical data, or did he switch horses at a uniquely convenient juncture? Did he use all of the proxy data, or did he conveniently jump back and forth through it? And lastly, is NASA a government-funded climate disinformation website?

    • Robert Austin says:

      Mann and his cronies executed a litany of dubious data manipulations to promote the global warming story. The book “The Hockey Stick Illusion” by Andrew Montford is a good read on the proxy “tricks” pulled by the “team”. (In)famous are the “hide the decline”, the “short centring” calibrations and the Yamal “one tree to rule them all”. The “climategate” leak was the icing on the cake for those of us following the saga. Back in those days Tony was “Steven Goddard”.

  2. conrad ziefle says:

    On looking at Britta’s graph, I have to ask, “”Did the Little Ice Age end in 1850, or was there only a temporary blip? Mann’s seems to say it did end, but I don’t get his data from 1902 to 1998. When I look at the data, it does not have that sharp upward swing. So what does he mean by “raw data?” Could he be lying about that?

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