Scientists say humans may need to take some carbon dioxide out of the atmosphere to stop global warming

The average level of carbon dioxide in the atmosphere across the globe passed 400 parts per million (ppm) last year, a symbolic and worrying milestone in growth of manmade climate change, the World Meteorological Organization (WMO) confirmed Monday.

The carbon dioxide concentration is unlikely to dip below the 400 ppm mark for at least several decades, even with aggressive efforts to reduce global carbon emissions, according to the WMO report, which confirms similar findings reported last month. Carbon dioxide can last in the atmosphere for thousands of years without efforts to remove it.

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The finding comes as the globe continues to experience record a series of temperature records. Eleven of the last 12 months have been the hottest on record and 2016 is widely expected to be the hottest year ever recorded. At the same time, governments from around the globe have made significant progress on the issue in the last several months—from quick ratification of the Paris Agreement to passage of new deals on aviation and HFC emissions.

Source: Justin Worland, Time

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