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Federal report cites human role in climate change

Rising sea levels, more recurrent heat waves and other extreme weather events will result from climate change caused by human activity, according to a report by the US Global Change Research Program, which involves NASA, the Energy and State departments and 10 other federal agencies. "Many lines of evidence demonstrate that it is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century," according to the report.

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