Keep in mind that the range of potential climate futures includes some pretty scary possibilities, ones that the IPCC doesn't like to talk about--such as completely ice-free arctic summers within a couple of decades. http://nsidc.org/news/press/2007_seaiceminimum/20071001_pressrelease.html
But, there is a question as to how to frame/construct a discussion to attempt to get (accelerate) movement toward serious change.
The "doom" scenario I can write/discuss (what drives me to work on Energize America, etc). But, the "doom" (or even reality?) scenario does not capture everyone.
And, well, once you get 'doubters' to consider the threats as possible, what do you get them to do? Not everyone is ready to go 'dark green' overnight, in one fell swoop. Blogging regularly at Get Energy Smart. NOW!!!