Join marine geophysicist and international educator Mike Coffin, PhD for a lecture titled “Greenhouse & Icehouse Worlds”. Earth’s climate over the ~4.54 billion year history of the planet has fluctuated between two primary states: greenhouse and icehouse Earth. Greenhouse Earth is characterized by no permanent glaciers; icehouse Earth by permanent glaciers. Coffin investigates interactions between the oceanic environment and the solid Earth, and will discuss scientific evidence for the two states, focusing mainly on the current icehouse Earth. Register for free at: https://nehlibrary.libcal.com/event/14451329