Sunsettommy
Diamond Member
- Mar 19, 2018
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A paper by Dr. Mann et al, was published in 1998 making outlandish claims (covering only the Northern Hemisphere) that crept into the 2001 IPCC report despite not being validated or reproduced by anyone.
Because of the dishonest support by the IPCC, it got undeserved support because NO ONE has yet posted a paper reproducing it thus a paper sailed through without knowing if it was good or bad.
Eventually the paper was exposed as junk by THIS PAPER in 2005 that set off a firestorm.
Today only silly warmists cling to this massive failure despite that it contradicted decades of research, that it covers only the continental Northern hemisphere.
His main proxy, Bristlecone Pine tree data was taken from a 1993 paper by Isdo and Graybill, as shown HERE
McKitrick stated:
"A very brief summary of the problems of the hockey stick would go like this. Mann’s algorithm, applied to a large proxy data set, extracted the shape associated with one small and controversial subset of the tree rings records, namely the bristlecone pine cores from high and arid mountains in the US Southwest. The trees are extremely long-lived, but grow in highly contorted shapes as bark dies back to a single twisted strip. The scientists who published the data (Graybill and Idso 1993) had specifically warned that the ring widths should not be used for temperature reconstruction, and in particular their 20th century portion is unlike the climatic history of the region, and is probably biased by other factors."
bolding mine
The paper is wrong in so many ways.....................
Because of the dishonest support by the IPCC, it got undeserved support because NO ONE has yet posted a paper reproducing it thus a paper sailed through without knowing if it was good or bad.
Eventually the paper was exposed as junk by THIS PAPER in 2005 that set off a firestorm.
Today only silly warmists cling to this massive failure despite that it contradicted decades of research, that it covers only the continental Northern hemisphere.
His main proxy, Bristlecone Pine tree data was taken from a 1993 paper by Isdo and Graybill, as shown HERE
McKitrick stated:
"A very brief summary of the problems of the hockey stick would go like this. Mann’s algorithm, applied to a large proxy data set, extracted the shape associated with one small and controversial subset of the tree rings records, namely the bristlecone pine cores from high and arid mountains in the US Southwest. The trees are extremely long-lived, but grow in highly contorted shapes as bark dies back to a single twisted strip. The scientists who published the data (Graybill and Idso 1993) had specifically warned that the ring widths should not be used for temperature reconstruction, and in particular their 20th century portion is unlike the climatic history of the region, and is probably biased by other factors."
bolding mine
The paper is wrong in so many ways.....................
