Scientists have concluded that climate change played a major role in triggering the catastrophic glacial mountain collapse that flooded parts of Nepal and Tibet last month, resulting in over 1,400 deaths and thousands still missing. The findings were detailed in a report released on Thursday by the World Weather Attribution (WWA) group.

The disaster was not caused by a single extreme weather event but rather a "compound crisis" exacerbated by long-term warming trends, according to the researchers. Factors contributing to the collapse include glacier retreat, permafrost thaw, and geological instability, all of which are intensified by rising global temperatures.

Researchers highlighted that "relentless warming" has elevated the freezing threshold in the high Himalayas. This exposes deep ice and permafrost to higher and prolonged thaw temperatures, consequently weakening mountain slopes. The report, titled "Rapid Warming in the Himalaya Exacerbates Geohazard Cascades Beyond Adaptation Limits," suggests these shifts are "fundamental, irreversible."

The implications of this "compound crisis" extend to adaptation limits, particularly for vulnerable nations like Nepal. Prime Minister Balendra Shah is scheduled to address the United Nations General Assembly on the urgent issue of climate change impacts next week. Nepal faces a hefty reconstruction bill estimated at $4.78 billion following the flood.

Nepal, a nation of 30 million people, contributes minimally to global greenhouse gas emissions, underscoring the disproportionate impact of climate change on developing countries. The WWA, known for its peer-reviewed methods in assessing global warming's role in extreme weather, found that July and August were the warmest months on local record, with temperatures approximately 5 degrees Celsius above normal.

Heavy snowfall in late 2025 also contributed to increased meltwater prior to the collapse. While a magnitude 7.8 earthquake in Nepal in 2015 may have further destabilized the slope, its exact contribution remains uncertain, the report noted.

Professor Friederike Otto, a climate scientist at Imperial College London and co-author of the study, emphasized that "climate change is one of the drivers" and must be discussed within the framework of "loss and damage."

The disaster saw a massive section of rock and glacier break away from Langtang Lirung mountain on August 26. This triggered a devastating flow of water, ice, and debris that swept downstream, destroying communities and vital infrastructure, leaving a trail of destruction and a high human toll.