Turnbull's second quote (from the IAC Executive Summary) is about the IPCC's use of unsupported or unclear probability assessments within the WG2 Summary for Policy Makers. (desmogblog.com)
Imprecise probability assessment of tipping points in the climate system. (spiritofmawson.com)
A probability assessment which I created for a top set year 9 class, but it is suitable for use at GCSE. (tes.com)