Swiss glacier collapse offers global warning of wider impact

Observer

31-05-2025

The collapse of the Swiss Birch glacier serves as a chilling warning of the escalating dangers faced by communities worldwide living under the shadow of fragile ice, particularly in Asia, experts say.
Footage of the May 28 collapse showed a huge cloud of ice and rubble hurtling down the mountainside, into the hamlet of Blatten. Ali Neumann, disaster risk reduction advisor to the Swiss Development Cooperation, noted that while the role of climate change in the specific case of Blatten "still needs to be investigated", the wider impacts were clear on the cryosphere -- the part of the world covered by frozen water.
"Climate change and its impact on the cryosphere will have growing repercussions on human societies that live near glaciers, near the cryosphere, and depend on glaciers somehow and live with them," he said.
The barrage largely destroyed Blatten, but the evacuation of its 300 residents last week averted mass casualties, although one person remains missing. "It also showed that with the right skills and observation and management of an emergency, you can significantly reduce the magnitude of this type of disaster," Neumann said at an international UN-backed glacier conference in Tajikistan. Stefan Uhlenbrook, Director for Hydrology, Water, and Cryosphere at the World Meteorological Organisation (WMO), said it highlighted the need for vulnerable regions, such as the Himalayas and other parts of Asia, to prepare.
"From monitoring, to data sharing, to numerical simulation models, to hazard assessment, and to communicating that, the whole chain needs to be strengthened," Uhlenbrook said. "But in many Asian countries, this is weak, the data is not sufficiently connected." - 'Not enough' - Swiss geologists use various methods, including sensors and satellite images, to monitor their glaciers. Asia was the world's most disaster-hit region due to climate and weather hazards in 2023, according to the United Nations, with floods and storms being the chief causes of casualties and economic losses.
But many Asian nations, particularly in the Himalayas, lack the resources to monitor their vast glaciers to the same degree as the Swiss. According to a 2024 UN Office for Disaster Risk Reduction report, two-thirds of countries in the Asia and Pacific region have early warning systems. But the least developed countries, many of whom are in the frontlines of climate change, have the worst coverage. "Monitoring is not absent, but it is not enough," said geologist Sudan Bikash Maharjan of the Nepal-based International Centre for Integrated Mountain Development (ICIMOD). "Our terrains and climatic conditions are challenging, but also we lack that level of resources for intensive data generation."
That gap is reflected in the number of disaster-related fatalities for each event. While the average number of fatalities per disaster was 189 globally, in Asia and the Pacific, it was much higher at 338, according to the Belgium-based Centre for Research on the Epidemiology of Disasters' Emergency Events Database. Geoscientist Jakob Steiner, who works in climate adaptation in Nepal and Bhutan, said it is not as simple as just exporting the Swiss technological solutions.
"These are complex disasters, working together with the communities is just as, if not much more, important," he said. - 'Sad disparity' - Himalayan glaciers, providing critical water to nearly two billion people, are melting faster than ever before due to climate change, exposing communities to unpredictable and costly disasters, scientists warn. Hundreds of lakes formed from glacial meltwater have appeared in recent decades. They can be deadly when they burst and rush down the valley. The softening of permafrost increases the chances of landslides.