If we want to limit climate change to +2°C, we must leave 80% of hydrocarbons into the ground. This option is not showing in the prices of energy companies. It's just not going to happen.
[1] http://www.economist.com/news/science-and-technology/2157446...
[2] http://wattsupwiththat.com/2013/09/16/lomborg-climate-models...
While it is an oversimplified game, Fate of the World can help show how increasing temperatures puts more energy into global systems resulting in intense storms, droughts, flooding, wildfires, famines, etc, and how that destabilizes regions leading to less effective ability to implement anti-warming policy.