The moronic OP was completely debunked in post #11.
Only denier cult retards disagree.
Funny how Micheal Mann only used tree ring samples from Siberia....yet you worship him....
Actually it was from a SINGLE tree in the entire grove. The rest of the grove showed nothing special.
As part of his Phd research,
Michael E. Mann worked with seismologist
Jeffrey Park on developing statistical techniques for find long term oscillations of natural variability in the
instrumental temperature record of global surface temperatures over the last 140 years;
Mann & Park 1993 showed patterns relating to the
El Niño–Southern Oscillation, and
Mann & Park 1994 found what was later termed the
Atlantic multidecadal oscillation. They then teamed up with
Raymond S. Bradley to use these techniques on the dataset from his
Bradley & Jones 1993 study with the aim of finding long term oscillations of natural variability in global climate. The resulting reconstruction went back to 1400, and was published in November as
Mann, Park & Bradley 1995. They were able to detect that the multiple proxies were varying in a coherent oscillatory way, indicating both the multidecadal pattern in the North Atlantic and a longer term oscillation of roughly 250 years in the surrounding region. Their study did not calibrate these proxy patterns against a quantitative temperature scale, and a new statistical approach was needed to find how they related to surface temperatures in order to reconstruct past temperature patterns.
[37][38]
Mann, Bradley and Hughes 1998[edit]
For his postdoctoral research Mann joined Bradley and tree ring specialist
Malcolm K. Hughes to develop a new statistical approach to reconstruct underlying spatial patterns of temperature variation combining diverse datasets of proxy information covering different periods across the globe,
including a rich resource of tree ring networks for some areas and sparser proxies such as lake sediments, ice cores and corals, as well as some historical records.[39]
Hockey stick graph - Wikipedia
What a fucked up liar you are, Mr. Westwall. Go ahead and show us a link from a credible source that states that the Mann Graph was made from one tree.