the concentration of carbon dioxide in earth’s atmosphere has climbed to a level last seen more than 3 million years ago — before humans even appeared on the rocky ball we call home.
the concentration of carbon dioxide in earth’s atmosphere has climbed to a level last seen more than 3 million years ago — before humans even appeared on the rocky ball we call home.
carbon dioxide in earth's atmosphere:50
about 34 million years ago, the time of the eocene–oligocene extinction event and when the antarctic ice sheet started to take its current form, co 2 was about 760 ppm, and there is geochemical evidence that concentrations were less than 300 ppm by about 20 million years ago.