On August 26, a mountain near the border between Nepal and Tibet collapsed, unleashing a massive flow of glacial ice and rock—equivalent to the volume of 100 football stadiums. This collapse triggered a powerful wave of water that surged downstream at speeds of up to 100 miles per hour, devastating nearby villages and claiming over 1,300 lives, with thousands more still missing. The scale of the disaster is particularly alarming, even in a region that regularly faces dangerous floods and landslides. Scientists have linked such extreme events to climate change, which is accelerating the melting of glaciers worldwide. Glacial melting can destabilize mountain slopes in ways that are hard to predict and often catastrophic, according to Mark Carey, a professor of environmental studies and geography at the University of Oregon. While research and monitoring have helped save lives in some regions, the vast and remote nature of the Himalayas makes it challenging to predict and monitor all potential dangers. This difficulty in early detection limits the effectiveness of warning systems in areas like Nepal. Since the last century, the world’s glaciers have lost about one-fifth of their mass and are expected to lose at least another quarter by 2100. Each degree of global warming accelerates this loss, with hundreds of billions of tons of ice melting annually. The consequences of this melting are far-reaching, including weakened bedrock and destabilized slopes. Retreating glaciers can leave behind natural dams made of dirt and rock, called moraines, which trap water. If these dams break, they can release massive amounts of water, as seen in glacial lakes in Alaska and the Andes. Efforts to monitor and manage these risks have had some success. In Peru, draining high-risk glacial lakes has likely saved tens of thousands of lives. In Switzerland, early warnings allowed the evacuation of 300 people before a glacier collapsed in the Alps. However, in Nepal, there is no comprehensive system to monitor sudden ice and rock collapses. Emerging technologies, such as seismic early-warning systems and fiber-optic sensors, are being tested to detect changes in glaciers. A new satellite, NISAR, has also shown promise in identifying subtle shifts in Earth's surface, including the movement of glaciers that could signal potential disasters. Despite these technological advances, predicting and preventing such events remains a significant challenge. As global temperatures rise and permafrost thaws, the risk of catastrophic glacial collapses is expected to increase. Mountain regions around the world are reaching critical thresholds, and the need for improved monitoring and preparedness is more urgent than ever.