The Greenland Ice Sheet: An Alarming Shift in Global Dynamics The Greenland Ice Sheet (GrIS), the planet's second-largest mass of permanent ice, covers approximately 1.7 million square kilometers and contains enough frozen water to raise global sea levels by an astounding 6 meters if fully melted. Illustration 1: Greenland Ice Sheet At Scale Transition to Instability A fundamental shift has occurred in the GrIS's status over the past two decades. Previously viewed as a stable