What changed
Swiss glaciers lost an estimated 5.5% of their remaining ice in the 12 months to October 2026, a pace scientists describe as disastrous. The loss far exceeded the previous one-year extreme benchmark of 2%, with even glaciers at 3,500 metres left without their usual summer snow cover.
Why it matters
The melt brought a short-term water boost, but it spent down a reserve that took decades or centuries to build. Swiss glaciers released an estimated 2.2 trillion litres of meltwater between July and September, helping ease water shortages during the summer.
That relief is not a durable solution. Meltwater supports irrigation, hydropower and shipping during hot, dry conditions, but smaller glaciers will be less able to replenish water supplies in future heatwaves. The Rhine already reached record lows in places this summer, affecting navigation and raising transport costs.
The mechanism is brutally simple. A mild winter left less snow on the glaciers. Heatwaves in May and June stripped away much of what remained, exposing darker ice that absorbs more sunlight and melts faster. At some of the highest measurement sites, scientists recorded four metres of ice loss where several metres of winter snow would normally remain.
The outlook is clear, though its exact consequences are not. Continued warming would make farming, hydropower and transport more vulnerable to reduced glacier runoff, while thinning ice and thawing frozen ground may raise some risks of unstable slopes and flash floods. The immediate water arrives as help; the longer-term cost is that there is less frozen water left to call on.
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