R coder mind of a Markov chain has replicated portions of the M&W work. They write: There are a bunch of “hockey sticks” that calculate past global temps. through the use of proxies when instrumental data is absent....
The 20th century warming counters a millennial-scale cooling trend which is consistent with long-term astronomical forcing.
MBH99
According to the UMass researchers, the 1,000-year reconstruction reveals that temperatures...