Those CO2 levels keep rising
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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.
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