This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: The massive and deadly floods on the Nepal–Tibet border are a stark reminder of why the world needs to constantly update its understanding of the fragile ecosystem in the Himalayas. These towering mountains contain nearly 90,000 glaciers, which sustain 10 major river systems.
Nearby countries, including India, Pakistan, China, Afghanistan, Nepal and Bhutan, rely on water resources that cross borders here. As major river-based hydro economies, their agricultural production, energy security and wider economic stability depend on the availability and timing of river flows. Changes in snowmelt, glacier retreat and water availability can cause untold hardship for millions of people who rely on them.
They can also create incredible danger, as seen in August 2026, when a flash flood caused by a collapsed glacier washed away villages, bridges and roads on both sides of the Tibet–Nepal border, killing more than 1,000 people. Understanding and measuring winter snowfall in these regions is exceptionally important. It is the main source of freshwater when released by melting snow during the region's warm, early-summer crop-growing seasons, when local communities need it most.
No one knows precisely how much water the mountains currently provide or how this will change. This knowledge gap also hinders our understanding of geohazards, including avalanches triggered by extreme snowfall events and flooding caused by rapid snowmelt. The recent Nepal disaster could be related to a spell of unusually warm weather.
This may have weakened the snowpack, creating rapid melt. I work with a team of glaciologists at the British Antarctic Survey, whose team had sensors 6 miles (10 km) from the site. Results suggest that enhanced melting could have introduced water into the crevasses, weakening the ice-rock connections.
Studies project that roughly half of the glacier ice in the Himalayas (equivalent to about 2 billion Olympic swimming pools) could melt by the end of this century—enough to raise sea level by more than 1 centimeter. But there is still considerable uncertainty in these projections. This is because we do not have enough measurements of snowfall and ice across large areas of this challenging terrain.
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