From what I see, there are four different types of (Un)Certainty involved in the CAGW narrative: 1) Computational, 2) Emotional and 3) Representational and 4) Ideological. (There may be more, or more subtle versions of these, but these 4 are probably close to the general breakdown.)
The IPCC 95% type is Computational Certainty, that is the outcome as proposed by models is consistent with input data and mathematical relationships between identified factors. McKibben’s certainty is based in Computational Certainty, as in “Do The Math”. It could also be labelled “Intellectual” Certainty, as it is based on the idea that nature is deterministic enough..
The second type, the Emotional Certainty, is what roots Gore, the IPCC Summary and the 97% Consensus concept. With Emotional Certainty, the statements say that we are personally comfortable with the work done and where it ended – with the understanding that not everything could be done, but we believe to be the most important parts were covered ..
Ideological Certainty is what drives the eco-green. Greenpeace, the Sierra Club, Maurice Strong, David Suzuki, Friends of the Earth, the Waterkeepers, opponents of the XL Keystone pipeline: the arguments for CAGW are mere backups for other, anti-capitalist, anti-consumerist, pro-nature beliefs .. With Ideological Certainty, the certainty is that continuing the path we are on, the status quo, will cause socio- and environmental damage that is unacceptable (and may be catastrophic) ..
The fourth type of Certainty is Representational, in which what is projected is compared to what, at an initial state, is observed. This is where the skeptical position focuses ..
What makes the CAGW fight persist, IMHO, is that we argue about “Certainty” as if we are dealing with the same thing and each side is either foolish, perverse, or a paid shill not to recognize what each side holds ..