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400ppm

CO2 Levels Topped 400 PPM Throughout The Northern Hemisphere Last Month

Reuters | Posted 07.26.2014 | Green

By Tom Miles GENEVA, May 26 (Reuters) - Carbon dioxide levels throughout the northern hemisphere hit 400 parts per million (ppm) for t...

CO2 Levels On Track To Top 400 PPM For A Month

Posted 03.18.2014 | Green

From Climate Central's Brian Kahn: Last year, atmospheric carbon dioxide briefly crossed 400 parts per million for the first time in human history....