‘Super-marine heatwaves’: A new phrase for a long-term concern

February 18, 2024: Waves roll toward the shore on Lake Michigan in St. Joseph, Michigan. The Great Lakes shorelines are historically ice-covered this time of year. Persistent warmth resulted in a steady decrease in ice coverage across the Great Lakes this winter, which reached a historical low of 2.7% on February 11. (Image credit: Scott Olson/Getty Images)