Scientists are increasingly concerned about the potential for rapid sea level rise, with a massive Antarctic glacier – dubbed the “doomsday glacier” – showing signs of a significant breakup. Researchers report substantial uncertainty regarding the extent of future sea level increases, but this glacier is a primary source of worry. A large ice mass is now appearing likely to detach from the glacier. Oceanographer Ola Kalén warns that changes could occur very quickly. The instability of this glacier poses a significant threat due to its size and potential impact on global sea levels. Further research is needed to accurately predict the timing and scale of the ice loss and its consequences.