While the future behavior of this seasonal march remains uncertain, the mid-Pliocene warm period (~3.3 to 3 million years ago) was the last time that atmospheric CO 2 levels (~400 ppm) were ...
While the future behavior of this seasonal march remains uncertain, the mid-Pliocene warm period (~3.3 to 3 million years ago) was the last time that atmospheric CO2 levels (~400 ppm) were similar ...