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Global CO2 Levels Set to Pass 400 ppm Milestone
2013-05-01 17:31:00| Climate Ark Climate Change & Global Warming Newsfeed
Guardian: The concentration of carbon dioxide in the atmosphere has reached 399.72 parts per million (ppm) and is likely to pass the symbolically important 400 ppm level for the first time in the next few days. Readings at the U.S. government's Earth Systems Research laboratory in Hawaii, are not expected to reach their 2013 peak until mid-May, but were recorded at a daily average of 399.72ppm on April 25. The weekly average stood at 398.5 on Monday. Hourly readings above 400ppm have been recorded six...
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