Humanity on Track to Soon Hit 1.5ºC Paris Accord Limit as Atmospheric CO2 Nears Level Not Seen in 15 Million Years
“A striking result we’ve found is that the warmest part of the Pliocene had between 380 and 420 parts per million CO2 in the atmosphere,” Chalk told the Guardian. “This is similar to today’s value of around 415 parts per million, showing that we are already at levels that in the past were associated with temperature and sea-level significantly higher than today.”
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