With atmospheric carbon dioxide concentrations having reached a “symbolic and significant milestone” in 2015—and with no signs of them abating this year—the World Meteorological Organization (WMO) said Monday that “a new era of climate change reality” is upon us.
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Boosted by the year’s exceptionally strong El Niño, that milestone was reaching worldwide average concentrations of carbon dioxide of 400 parts per million (ppm) for the first time ever. “The last time CO2 was regularly above 400ppm was three to five million years ago, say experts,” the BBC writes.
The data in for this year offers little hope for a better emissions scenario. “I think we’re essentially over for good,” Ralph Keeling, director of the greenhouse gas monitoring station at Mauna Loa, Hawaii at the Scripps Institution of Oceanography, said in May. With data from September (typically the low point of the year) showing levels above 400 parts per million, Keeling warned last month, “it already seems safe to conclude that we won’t be seeing a monthly value below 400 ppm this year —or ever again for the indefinite future.”
With that in mind, the WMO in its Greenhouse Gas Bulletin states that it is likely that “2016 will be the first year in which CO2 at the Mauna Loa Observatory remains above 400 ppm all year, and hence for many generations.”
One bright spot that occurred last year in the fight to avert climate crisis, said WMO Secretary-General Petteri Taalas in a press statement, was the Paris climate agreement, which will enter into force next month.
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