The last time carbon dioxide levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica. That was 2.6-5.3 million years ago

The last time carbon dioxide levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica.

That was 2.6-5.3 million years ago. https://t.co/lOQ8w0HXgG

— CNN (@CNN) April 13, 2019