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3 May 2013
Global Carbon Dioxide Levels Approaching 400 PPM
We are very near passing a milestone. The CO2 levels will likely soon reach 400 ppm at the Mauna Loa Observatory in Hawaii. The curve of course is named after Charles Keeling who started the measurements in 1958. They started it because even then there was concern that we might be dangerously interfering with our climate by burning fossil fuels. They just did not know, and when scientists do not know, they …