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Greenhouse Gas Levels Approach 'Worrisome' Milestone

April 24, 2013 9:58 a.m.

Greenhouse gas carbon dioxide (CO2) is increasing at a steep rate in the Earth's atmosphere and approaching a troubling new milestone: The heat-trapping gas could reach sustained levels of 400 parts per million of carbon dioxide by next month.

Related Story: Greenhouse Gas Levels Approach 'Worrisome' Milestone


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