New research reveals that an inconic Argentine glacier is undergoing its most significant retreat in a century. The Perito Moreno Glacier in the Southern Patagonian Ice Field has started losing contact with the bedrock, shedding more ice and moving backward. This change underscores the fragile balance of one of the world’s most well-known glaciers. Researchers believe the retreat is a delayed response to climate change. The glacier’s melting could have broader implications for understanding potential changes in larger ice masses, like those in Antarctica. Glacial melting matters because it could cause catastrophic sea level rise, harming and displacing people living in coastal and island areas.