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Carbon dioxide levels hit landmark in Northern Hemisphere

Half the world sees full month at or above symbolic 400 parts per million CO2 level

4:52pm, May 28, 2014

SPEWING GAS  Burning fossil fuels spews carbon dioxide into the atmosphere. In April, CO2 levels reached a monthlong record of 400 parts per million across the Northern Hemisphere. 

April was the first month in recorded history with average carbon dioxide levels at or above 400 parts per million across the Northern Hemisphere, according to a May 26 announcement by the World Meteorological Organization.

Climate scientists first recorded the troubling peak in the greenhouse gas in the Arctic in 2012 and in Hawaii last year (SN: 12/28/2013, p. 26), but the rest of the globe had yet to consistently hit the high mark. The 400 ppm level is largely symbolic, representing nearly 150 percent of the CO2 levels of pre-industrial times.

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