The Roulette Wheels sort of under-cut their conclusions a bit...in either case, the world get hotter.

To illustrate the findings of their model, MIT researchers created a pair of 'roulette wheels.' The wheel on the right depicts their estimate of the range of probability of potential global temperature change over the next 100 years if no policy change is enacted on curbing greenhouse gas emissions. The wheel on the left assumes that aggressive policy is enacted. Image courtesy / MIT Joint Program on the Science and Policy of Global Change



Climate change odds much worse than thought
New analysis shows warming could be double previous estimates
David Chandler, MIT News OfficeMay 19, 2009
The most comprehensive modeling yet carried out on the likelihood of how much hotter the Earth's climate will get in this century shows that without rapid and massive action, the problem will be about twice as severe as previously estimated six years ago - and could be even worse than that. READ THE REST AT http://web.mit.edu/newsoffice/2009/roulette-0519.html