Disgraceful Science
Steve McIntyre remains on the case.
Discussing a new report regarding Sea Ice At Lowest Level In 800 Years Near Greenland, McIntyre notes the secrecy and data manipulations:
These seemingly high 12th century values do not enter into the sea ice reconstruction of Macias Fauria et al 2009, because it begins in 1200. I'm sure that there is an excellent reason for not including 12th century data.And further manipulation:
The Divergence Problem is well worth reading about. I've got a number of threads about it with quotes that need to be read to be believed. Basically, the problem is that tree rings go down in the last half of the 20th century while temperatures go up - rendering the proxies problematic, to say the least. Climate scientists "deal" with this by calling it the "Divergence Problem". They assume that the Divergence Problem is due to some unknown anthropogenic cause and, relying on this cargo cult practice, assume that it doesn't matter and delete the inconvenient data - sometimes, as in IPCC TAR, without any disclosure. This practice did not originate in Mann 2008; Briffa originated it. It's a disgraceful practice.