Mauna Loa Observatory Revealed CO2 Levels have Reached 400 ppm.
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The daily average atmospheric concentration of carbon dioxide as measured by the Mauna Loa Observatory has officially passed four hundred parts per million. Scientists around the globe have been expressing their concern over this new milestone as CO2 concentrations have never exceeded 280 ppm over the last million years. While some scientists believe this milestone will be a turning point towards clean technology to reverse this trend, others believed we are in a danger zone as we hit 400 ppm in carbon dioxide atmospheric concentration.
Link: http://www.guardian.co.uk/environment/2013/may/10/carbon-dioxide-highest-level-greenhouse-gas
Date & source: May 13, 2013, Guardian UK
