1. http://www.epa.gov/climatechange/ last updated 9/8/09 by: The U.S. climate change policy information is taken from White House and Department of State fact sheets, speeches and reports.
 2. http://topics.nytimes.com/top/news/science/topics/globalwarming/index.html uppdated oct. 9 2010 by

Subhankar Banerjee for the Associated Press