Carbon Dioxide Passed Critical Threshold in 2015

Climate Central :On Monday, the World Meteorological Organization released another reminder of the planetary predicament we’re in: The earth’s atmosphere permanently passed the 400 parts per million (ppm) threshold last year.

It’s the first year in human history where carbon dioxide levels have reached the symbolic milestone for an entire year. But it certainly won’t be the last as humans continue to treat the atmosphere as a waste dump for carbon pollution.

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