From a Twitter thread by ClimateWatcher
At 320 ppm [of CO2] we're basically back in the Pliocene
[The Pliocene was from 5.3 to 2.6 million years ago, when temperatures were 2-3 degrees C higher than today. Wikipedia's article on the Pliocene]
[Which means that most of Greenland's ice will melt, which would mean sea levels would rise 6 metres, or 20 feet.]
And we've got there magnitudes faster than anything we know about.
[The PETM is the Paleocene–Eocene Thermal Maximum, when global temperatures rose 5-8 degrees C.]
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