Warming gas levels hit 'troubling milestone'

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Warming gas levels hit 'troubling milestone'

by Associated Press Videos 1:49 mins

Warming gas levels hit 'troubling milestone'

by Associated Press Videos 1:49 mins

The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant. Associated Press science writer Seth Borenstein explains. (May 31)

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