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Trouble in the Air: Atmospheric CO2 Levels Reach Historic Levels

The level of carbon dioxide (CO2) in our atmosphere may never fall below 400 parts per million (ppm) ever again. That's the headline from a year's worth of test results on CO2 levels from the Mauna Loa Observatory in Hawaii. In a study released this month, lead author professor Richard Betts of the University of Exeter blames the cyclical Pacific Ocean warming phenomenon known as El Nino in part for the grim record. In his research, published in Nature Climate Change, Betts...

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