The Himalayas are approaching a dangerous threshold as glaciers melt faster, glacial lakes grow more unstable and the mountains face a widening gap in monitoring, according to new research. The findings come in the aftermath of devastating floods in Nepal and Tibet, which killed more than 1,300 people and caused widespread destruction, highlighting the growing risks from a rapidly changing Himalayan environment. Himalayan glaciers are now losing mass 65% faster than they were a decade ago, the report by global consultancy Systemiq, produced with the Integrated Mountain Initiative and with technical contributions from the International Centre for Integrated Mountain Development (ICIMOD) and GB Pant National Institute of Himalayan Environment, says.
Yet only about 21 of the estimated 40,000 glaciers across the Himalaya-Karakoram region are being monitored in detail and on a sustained basis, according to the report. That monitoring gap matters because the physical landscape is changing rapidly. As glaciers retreat, they can leave behind expanding lakes held back by unstable deposits of rock and ice.
At the same time, warming is destabilising permafrost - permanently frozen ground that can thaw as temperatures rise - and high mountain slopes, increasing the possibility of cascading hazards, the report says. India already has evidence of the scale of the risk. Some 18% of Indian land is Himalayan, yet the region accounts for about 35% of disasters, according to the report.
The government told parliament in July that 56 glacial lakes had been classified as "very high risk", external following a 2025 scientific assessment of 189 high-risk lakes in the Indian Himalayan region. The Central Water Commission is monitoring 2,485 glacial lakes larger than 10 hectares across India's Himalayan river basins, the government said. The Himalayas have already seen devastating examples of what can happen when glacial lakes burst their natural dams.
In 2023, a glacial lake outburst flood in Sikkim killed at least 70 people and caused widespread damage to roads, bridges and hydropower projects. In 2021, a similar disaster in Uttarakhand killed more than 200 people after a massive flood swept through the Rishiganga and Dhauliganga valleys. But the danger is not confined to spectacular floods.
The Himalayas are a vast natural water system feeding rivers that sustain hundreds of millions of people across South Asia. ICIMOD says "peak water", external is expected around mid-century in most Hindu Kush Himalayan river basins - the point at which glacier runoff reaches its maximum before declining as glaciers lose mass. The new research puts an unusually large economic number on that dependency.
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