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Those CO2 levels keep rising

July 2nd, 2014

At the Mauna Loa observatory in Hawaii, where CO2 levels in the atmosphere have been measured since 1958, they have just recorded for the first time three consecutive average monthly levels above 400 parts per million. While there is nothing magical about 400 ppm when it comes to influencing world temperatures, it is another sign that atmospheric concentrations of the greenhouse gas which helps drive global warming are very much on the rise.

2-07-2014 meanCO22-07-2014 fullCO2recordThe dashed red lines represent the monthly mean values, centered on the middle of each month. The black line represents the same, after correction for the average seasonal cycle.


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