Surface melt water rushing along the surface of the Greenland Ice Sheet through a supra-glacial stream channel, southwest of Ilulissat, Greenland.
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Graphs issued by the United Nations agency showed levels of carbon dioxide, the main greenhouse gas, climbing steadily towards the 400 parts per million (ppm) level, having hit a new record every year since reliable records began in 1984 .Carbon dioxide levels averaged 397.7 ppm in 2014 but briefly breached the 400 ppm barrier in the northern hemisphere in early 2014, and again globally in early 2015 .The rise in carbon dioxide levels was being amplified by higher levels of water vapor, which were in turn rising because of carbon dioxide emissions, the WMO said.Levels of the other two major man-made greenhouse gases, methane and nitrous oxide, also continued their relentless annual rise in 2014, reaching 1,833 parts per billion (ppb) and 327.1 ppb, respectively.
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