Re: 2100
I don't know where you get the idea that all models show a linear pattern of growth. They actually show abrupt changes not a gentle linear increases. I work with more than 140 climate scientists and none of them have found a gentle linear motion.
And, as you can see here, climate sensitivity is actually more than we expected not less. http://www.climatescience.org.au/content/680-solution-cloud-riddle-reveals-hotter-future