‘No doubt’ of climate change’s role in deadly China-Nepal flood, say scientists

Scientists are unequivocal that climate change played a significant role in last month's catastrophic glacial mountain collapse on the China-Nepal border, resulting in over 1,400 fatalities and at least 6,600 people missing. The World Weather Attribution group, comprising climate scientists, determined that the disaster was not caused by a singular extreme weather event, but rather a complex crisis encompassing long-term warming, glacier retreat, permafrost thaw, and geological instability.

The relentless rise in temperatures has elevated the freezing threshold on the Himalayas, exposing ice and permafrost in deeper bedrock, which in turn has weakened mountain slopes. A massive chunk of rock and glacier broke away from Langtang Lirung mountain on August 26th, unleashing a deluge of water, ice, and debris that swept downstream, obliterating communities and infrastructure.

Walter Immerzeel, a mountain hydrologist at Utrecht University and co-author of the WWA report, noted that the region is experiencing fundamental, irreversible shifts. The glacier retreat and permafrost degradation are undermining mountain stability. He informed reporters that the 2015 earthquake may have further weakened the slope, though its exact contribution remains unclear.

The study revealed that July and August 2026 were the warmest months recorded locally, while heavy snowfall in late 2025 contributed to increased meltwater before the collapse. The disaster has also ignited discussions about the limits of adaptation efforts. Nepal's Prime Minister Balendra Shah will address the UN General Assembly next week to discuss the urgent issue of loss and damage due to climate change.

Nepal estimates the reconstruction bill will reach US$4.78 billion, while China has reported 43 deaths and 519 missing, bringing the combined toll to 1,446 dead and at least 6,669 missing.