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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteClimate change is warming the high Hindu Kush Himalaya (HKH), accelerating glacier melt and changing snow cover, snowfall and permafrost. For Nepal, that can mean more meltwater in the short term but less glacier-stored water after a glacier passes “peak water.” It does not mean the country will simply run out of water: river supply also depends on rain, snow, groundwater, seasonality, infrastructure and demand, and effects vary from one basin to another.
How is climate change changing Himalayan glaciers?
Higher temperatures increase ice melt and alter other parts of the mountain cryosphere—the frozen water and ground that includes glaciers, seasonal snow and permafrost. The Hindu Kush Himalaya assessment published by ICIMOD in 2023 describes high-elevation warming, faster glacier melt, declining snow cover, thawing permafrost and more erratic snowfall across the region. Nepal is part of this system, but a regional assessment is not a measurement or forecast for every Nepali valley.
Two recent ICIMOD figures describe different aspects of the change. The first concerns glacier mass; the second concerns glacier area. They cover different periods and should not be treated as interchangeable:
| Measure | Finding | Scope and qualification |
|---|---|---|
| Glacier mass loss | Mass loss was 65% faster in 2011–2020 than in the preceding decade. | ICIMOD, 2023; HKH glaciers region-wide, not Nepal alone. |
| Glacier area | Glacier area decreased by 12% between 1990 and 2020. | ICIMOD, 2026; HKH region-wide, with particularly rapid losses reported in the eastern and central HKH. |
| Projected glacier volume | Up to 80% of current glacier volume could be lost by the end of the century under current emissions trajectories. | ICIMOD, 2023; a conditional projection for the HKH, not a Nepal-only forecast. |
Mass measures how much ice a glacier contains; area measures how much land it covers. Neither figure alone tells a reader how much water a particular Nepali river will carry in a given season.
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Will melting Himalayan glaciers cause water shortages in Nepal?
Glacier melt affects river flow over time. When warming increases melt, runoff from a glacier can rise temporarily. That additional flow is not an endlessly renewable supply: as the glacier loses stored ice, it has less water to release. The point at which glacier runoff reaches its maximum before declining is known as “peak water.”
The IPCC’s Special Report on the Ocean and Cryosphere in a Changing Climate explains that changes in glacier runoff can affect people near glaciers and far downstream, including people who rely on water for drinking and agriculture. It also reports drinking-water decreases in rural Nepal Himalayan settings. These documented local impacts are not evidence that every community or basin in Nepal experiences the same shortage.
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Glacier melt is only one part of river supply. Snowmelt, rainfall, groundwater, the timing of precipitation, local water systems and demand also shape how much water people can access. The sources cited here do not establish a comparable Nepal-wide percentage for how much water comes from glacier melt, nor do they support a single nationwide shortage forecast.
When will glacier-fed rivers reach peak water?
ICIMOD’s 2023 assessment projects that water availability across the HKH will peak around mid-century and then decline. This is a regional projection subject to substantial uncertainty, not a precise date for Nepal as a whole or for any named river basin. A basin’s timing and flow depend on local glacier conditions and on other water sources, including snow and rain.
The useful distinction is between near-term flow changes and longer-term loss of ice storage. More melt can temporarily raise runoff, while continuing glacier shrinkage eventually reduces the ice available to sustain that contribution. A regional peak-water estimate should therefore not be read as a schedule for an individual community’s water supply.
What other risks come with glacier and permafrost change?
Changes in the cryosphere can affect mountain hazards as well as water flow. ICIMOD describes decreasing permafrost extent as a contributor to increased landslides and infrastructure problems at high elevations. A glacial lake outburst flood (GLOF) occurs when water is suddenly released from a glacier-fed lake.
Flooding, landslides, erosion and sedimentation can occur alongside GLOF risks in a catchment. These hazards can damage roads, settlements, hydropower, irrigation and water systems. Regional evidence establishes that such risks matter in the HKH; it does not establish that every valley faces the same hazard or that a particular event will occur at a specific site.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How are Nepal’s glaciers being monitored?
ICIMOD and partners have systematically monitored Nepal’s Yala and Rikha Samba glaciers since 2011. Yala also has an ICIMOD record of seasonal and annual mass-balance observations. Field measurements help track changes at individual glaciers, while remote sensing and modelling help build a broader regional picture; ICIMOD’s cryosphere programme also describes integrating mountain communities’ traditional knowledge into understanding and decisions.
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Combining these approaches matters because a satellite-scale regional trend and a field record from one glacier answer different questions. Neither, on its own, provides a complete forecast of water availability for every downstream user.
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