Brian Zinchuk: How a real life Hoth ice base in Greenland in the 60s calls CO2 concerns into question today

Whoa, there, Nelly! You’re telling me that carbon dioxide levels were a full third less than they are at this very moment, and yet the northernmost portions of Greenland (the most likely to freeze) was tundra? It did not have most of a mile of ice covering it? Well below the supposedly crucial threshold of 350 parts per million?
Maybe the science isn’t settled, after all.