First broadcast November 2007
The United States of America produces one quarter of the world's carbon dioxide emissions.
In this three-part series, Laura Trevelyan, the BBC's United Nations correspondent in New York, finds out how the US could retreat from its role as the biggest polluter on the planet.
Programme 3: How Green is Your Valley
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In the final part of the series, Laura Trevelyan explores the degree to which Americans are speaking out and altering their lifestyles in the face of global warming.
She considers the size of the US's carbon footprint in relation to urban sprawl and the work of the "New Urbanists" to create greener places for Americans to live in.
She also looks at the grass-roots activism of California's Sierra Club, which successfully fought the huge polluting Port of Long Beach, south of Los Angeles.
Laura will also be assessing the perceived failure of the media to keep Americans well informed on green issues and looking at the growth of interest in Hollywood among documentary makers and celebrities.
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