The U.S. has done the least among the world's eight largest economies to address global warming, according to a study released on July 3, 2008 by the World Wildlife Fund.

The report also found that none of the eight countries are making improvements large enough to prevent temperature increases that scientists think would cause catastrophic climate changes.

The scorecard ranked Britain as the developed nation that has done the most to reduce carbon dioxide emissions and reach targets set by the Kyoto Protocol.

France and Germany are close behind. Germany was praised for its investment in renewable energy. 'But all three countries are at best half as far along the road as they should be,' a statement announcing the study said.

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