The Environmental Protection Agency on Monday will complete its determination that greenhouse gases pose a danger to human health and the environment, paving the way for regulation of carbon dioxide emissions from vehicles, power plants, factories refineries and other major sources.
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The agency finding also will allow Mr. Obama to tell delegates at the United Nations climate change conference that began today in Copenhagen that the United States is moving aggressively to address the problem.
The E.P.A. administrator, Lisa P. Jackson, is expected to announce the step at a news conference this afternoon in Washington.
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