| 22-12-2015 23:48 | |
| Tai Hai Chen★★★★☆ (1085) |
jdm wrote: At the peak of the Pliocene some 4 million years ago, CO2 reached 415 ppm because of very high temperature. Next year CO2 level 404 ppm. https://scripps.ucsd.edu/programs/keelingcurve/2013/12/03/what-does-400-ppm-look-like/ |
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