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The last time carbon dioxide (CO2) levels were as high as today was over 3 million years ago during the Pliocene epoch. At that time, global temperatures were 2-3 degrees Celsius warmer, sea levels were 15-25 meters higher, and the Arctic was ice-free.

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1y ago

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When were carbon dioxide levels as high as they are today?

The last time atmospheric carbon dioxide levels were as high as they are today (approx. 380 ppm (parts per million)) was around 15 million years ago, during the Middle Miocene period, when carbon dioxide levels are calculated to have been around 400 ppm. During that time there was no permanent ice in the Arctic and very little over Antarctica or Greenland. On top of that, sea levels were between 75 and 120 ft higher than they are today and world temperatures were higher by between 5 and 10o F.


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