Scientists from the World Weather Attribution group have determined that climate change significantly contributed to a deadly flood near Nepal's border with China on August 26. The disaster killed more than 1,300 people and left over 5,000 missing when a mountain slope collapsed due to long-term warming effects such as glacier retreat and permafrost thaw, destabilizing the area and triggering a massive flow of water and debris. Climate change has pushed the freezing threshold upward by about 100 meters per decade, causing rock at high elevations to remain unfrozen longer and become more unstable, while glaciers have been thinning by over half a meter annually for decades.
Written by the local model on 2026-09-17,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Story summary
On August 26, 1,300 people were killed and over 5,000 remain missing after a massive section of glacier and rock collapsed near the border between Nepal and China, triggering catastrophic flooding that caused billions in damage. A report by the World Weather Attribution found human-caused global warming likely contributed to the disaster by thinning glaciers and thawing mountain permafrost, destabilizing the slope where the collapse occurred. Though not an extreme weather event itself, long-term changes linked to climate change are evident. Researchers also noted a significant role of rising temperatures causing glacier retreat across the Himalayas, increasing instability in the region. Nepal's foreign minister, Shisir Khanal, called on major polluters like India and China for climate compensation, emphasizing the need for global action despite minimal local contributions to greenhouse gases.
Written for “Climate Change Impacting Nepal Flooding” on 2026-09-17,
grounded in this article and the 7 other(s) covering the same event.
Researchers said the flood was caused by a "compound crisis" shaped by long-term warming, glacier retreat, permafrost thaw and geological instability.
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flood → say → warming
A 2015 earthquake is also thought to have played a role.
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earthquake → think → role
Climate change played a significant role in last month's deadly Himalayan disaster in Nepal, thinning glaciers and thawing mountain permafrost in ways that likely destabilised the slope before it collapsed, a report released Thursday by the World Weather Attribution group said.
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report → play → group
The collapse, near Nepal's border with China on 26 August, triggered a torrent of water, ice, boulders and sediment that swept through communities along the Trishuli River corridor, killing more than 1,300 people and leaving over 5,000 missing.
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that → trigger → 5,000
"This disaster was not an extreme weather event, but the fingerprints of climate change are still clear to see in long-term changes," said Ben Clarke, a climate researcher at Imperial College London who contributed to the report.
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who → see → report
Climate scientists said that across the Himalayas rising temperatures are causing glaciers to retreat and permanently thawing ground that helps bind fractured mountain rock together.
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that → say → rock
That means climate change can alter not only weather hazards such as heat and heavy rain but also the stability of the mountains themselves — threatening communities concentrated in narrow river valleys below.
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change → mean → valleys
The analysis did not determine whether the collapse would have happened without climate change, caused mainly by the release of greenhouse gases when fuels like oil, gas and coal are burnt.
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fuels → determine → oil
However, researchers concluded that warming intensified several processes that made the slope less stable over decades.
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slope → conclude → decades
Global warming weakens high mountain slopes
The report found that one of the clearest changes directly linked to climate change was the rising elevation of the freezing threshold.
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one → weaken → threshold
Warming had pushed the altitude at which ground remains consistently frozen upward by roughly 100 metres per decade, according to the report.
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ground → push → report
This exposes rock at increasingly high elevations to longer periods above freezing, thawing permafrost and causing cracks within the ice, ultimately weakening the rock face under the ice.
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This → expose → ice
Jakob Steiner, a geoscientist at the University of Graz who has worked in the Himalayan region since 2006 but is not an author of Thursday’s report, said monitoring instruments around 5,000 metres now show that some rock and ground no longer remain frozen throughout the year.
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rock → work → year
“This means that the ground that was sitting below ice for hundreds and thousands of years is now becoming exposed,” said Steiner.
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Steiner → mean → years
The report also found that glacial retreat was another destabilising force.
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retreat → find → ?
Glaciers in the region have been losing mass for decades at a rate equivalent to more than half a metre of thinning each year, the report found.
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report → lose → thinning
The Langtang Lirung glacier, located in the region where the disaster occurred last month, has retreated about half a kilometre since the 1990s, exposing rock once covered by ice.
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disaster → locate → ice
The Himalayan region contains the largest volume of snow and ice outside the polar regions.
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region → contain → regions
More than 63,000 glaciers in the area feed at least 10 major Asian river systems and support the food, water, energy and livelihood security of billions of people.
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glaciers → feed → people
However, various studies have found that around 78% of the glacier area, located between 14,763 and 19,685 feet above sea level, is highly exposed to warming.
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% → find → warming
United Nations reports have found that between 2000 and 2019, glaciers lost 267 billion tonnes of ice per year, roughly equivalent to the mass of 46,500 Great Pyramids of Giza.
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glaciers → find → Giza
As glaciers shrink, they can remove pressure that helped support adjoining rock walls while producing additional meltwater.
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that → shrink → meltwater
According to the analysis, the weeks before the 26 August collapse were also unusually warm.
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weeks → accord → collapse
July and August 2026 were the warmest such months recorded locally.
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July → record → ?
“Other than the potential geological factors like earthquakes that are weakening the bedrock, all these other factors are made worse by human-induced climate change,” said Friederike Otto, climate scientist at Imperial College London and one of the report’s authors.
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Otto → weaken → authors
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