The Huffington Post, December 15, 2009 by Andrew Guzman
http://www.huffingtonpost.com/andrew-guzman/the-true-costs-of-climate_b_392510.html?view=screen
Before we decide how much we’re willing to spend to mitigate climate change, we need to know what it will cost if we don’t. The conventional view in policy circles is that climate change will cost the United States somewhere between 0 and 2 percent of GDP by the year 2100. But a more thorough accounting points to a much heavier price.