Curator and Research Scientist, Department of Paleobiology, Smithsonian Institution
Expertise: Paleoclimate, Paleocene Eocene Thermal Maximum
Qualifying publication(s): see criteria
It’s true that the current carbon dioxide level is higher than any time in human existence
"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"
SOURCE: Denise Chow, NBC News
Published: 18 May 2019