California Governor Arnold Schwarzenegger is seen in Los Angeles, California June 6, 2006. Schwarzenegger, who has accused fellow Republican President George W. Bush of failing to demonstrate leadership on climate change, said he reached a 'historic agreement' with Democrats to make California a world leader in reducing carbon emissions. (Phil McCarten/Reuters)
The Greenland ice sheet in an undated satellite image. Ice Age evidence confirms that a doubling of greenhouse gases could drive up world temperatures by about 5.4 Fahrenheit, causing havoc with the climate, a study showed on Friday. REUTERS/NASA/SVS/Handout