Climate Change : Towards Cascading Disasters in High Mountain Regions

The 2025 collapse in Switzerland’s Lötschental Valley provides a striking example of this evolution. A large rockfall destabilized a glacier, which subsequently collapsed and generated an ice-and-debris avalanche that altered the course of a river and affected the village of Blatten. According to researchers, including Kristen Cook, an IRD researcher at ISTerre, these cascading events reflect the emergence of unprecedented hazards driven by ongoing climate change.

Across the world’s major mountain regions, especially in the Hindu Kush–Himalaya, researchers stress the importance of incorporating risk assessment into the planning and development of infrastructure projects. They also advocate for stronger early warning systems that actively engage local communities, whose knowledge and participation are essential for effective disaster risk reduction.