Unsettled science: Michael Mann privately admits that climate history over the last millenium is "obviously, ...one of the most (if not the most) contentious areas in the entire [IPCC] report"

Email 319

Keith, just a quick note to let you know I've had a chance to read over the key bits on last millennium in the final version of the chapter, and I think you did a great job. obviously, this was one of the most (if not the most) contentious areas in the entire report, and you found a way to (in my view) convey the the science accurately, but in a way that I believe will be immune to criticisms of bias or neglect--you dealt w/ all of the controversies, but in a very even-handed and fair way. [Michael Mann]

IPCC AR4 data

Keith Briffa was a Lead Author and Tim Osborn was a Contributing Author to Chapter 6 ("Palaeoclimate") of the Contribution of Working Group I to
the Fourth Assessment Report ("AR4" for short) of the Intergovernmental Panel on Climate Change (IPCC), published in 2007.