The best science available suggests that without taking action to fundamentally change how we produce and use energy, we could see temperatures rise 9 to 11 degrees Fahrenheit over much of the United States by 2090.
http://www.washingtonpost.com/wp-dyn/content/article/2010/11/05/AR2010110507305.html
Lets see how realistic that is. According to NCDC, the US is warming at 1.2 degrees per century. (Half of that is due trend to upwards USHCN adjustments, but that is a different conversation.)
During the past decade (2000-2009) US temperatures have been falling at a rate of 7.3 degrees per century.
So where does the predicted 9-11F rise come from?
It appears that the political support for catastrophic global warming is rooted in people who have their heads planted firmly up their nether regions.