Brian Huber is a climate detective at the Smithsonian who grew up collecting arrowheads in the woods of Ohio, but now collects and studies fossils from sediment cores. Brian uses fossils of tiny organisms − foraminifera − to track climate over millions of years, including the Cretaceous Hot Greenhouse climate. We talked to Brian about a time when the poles were not so icy, how climate changed, and what that bodes for the future.

This episode was produced by Devin Reese and mixed by Collin Warren. Editing and production assistance by Jace Steiner.