A major avalanche in Nepal that tore through approximately 2.2 square kilometres of mountain face and crashed into the valley below has been linked to human-caused climate change by an international team of scientists, according to a new attribution study. The analysis, conducted under the World Weather Attribution (WWA) initiative — a collaborative network of researchers who study how climate change influences extreme weather and geophysical events — represents a growing effort to quantify the role rising global temperatures play in intensifying hazards in fragile mountain ecosystems.
The avalanche, which occurred in Nepal's high Himalayan region, ripped across a vast stretch of steep terrain before crashing into the valley below, devastating the landscape in its path. Scientists say the event illustrates how warming temperatures are destabilising glaciers and permafrost across the Himalayas, increasing the likelihood of such catastrophic slope failures. Warmer air holds more moisture and raises average temperatures at high altitudes, weakening the structural integrity of snow and ice fields that have historically remained stable.
The WWA team uses a rigorous methodology, comparing observed climate data against computer models that simulate a world with and without human-driven greenhouse gas emissions. Their approach allows researchers to assign probabilities to how much climate change increased the likelihood or severity of a given extreme event. In this case, the scientists concluded that the conditions favourable for large-scale avalanches in the region have become significantly more common in recent decades due to rising temperatures.
Nepal sits on some of the world's most vulnerable mountain terrain. The country's glaciers are retreating rapidly, and communities in high-altitude valleys face growing risks from glacial lake outbursts, landslides, and avalanches. Scientists warn that without urgent global emissions cuts and stronger local adaptation measures, such events will become more frequent and more destructive.
The study adds to a mounting body of evidence that climate change is not a distant threat but an active driver of extreme hazards in mountain regions worldwide. Researchers say attribution studies like this one are essential tools for informing policy, building resilience in vulnerable communities, and holding governments accountable for climate action.
