8 years ago
Earth's CO2 Levels Have Crossed A 'Red Line'
In May 2013, the carbon dioxide monitoring station at Mauna Loa, Hawaii, recorded a major milestone — the concentration of atmospheric carbon dioxide had crossed the symbolic “red line” of 400 parts per million for the first time since record-keeping began. Then, earlier this year, for the first time in 4 million years, carbon dioxide levels at the South Pole passed the threshold of 400 ppm.
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