For the first time in human history, atmospheric CO2 concentrations exceeded 400 parts per million (ppm) in 2015. They're expected to do so again this year, and every subsequent year for many generations to come, according to a new report issued by the World Meteorological Organization.
For the first time in human history, atmospheric CO2 concentrations exceeded 400 parts per million (ppm) in 2015. They're expected to do so again this year, and every subsequent year for many generations to come, according to a new report issued by the World Meteorological Organization.
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