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A catastrophic glacier collapse in the Himalayas has left hundreds dead and thousands in dire need of assistance, according to recent reports. The disaster, which struck in the border region between Nepal and Tibet, was triggered when a section of the Langtang Lirung mountain, located at an elevation of 7,000 meters, gave way, taking a part of the glacier with it.
The resulting debris flow, a mix of ice, rock, and mud, surged into the Lhende Khola river, picking up more sediment and water as it traveled downstream. The Red Cross estimates that over 90,000 people have been directly affected by the disaster, with many in urgent need of aid as the crisis continues to unfold.
Jeffrey Kargel, a senior scientist at the Planetary Science Institute, explained that the debris flow covered its initial 22 kilometers at an average speed of 193 kilometers per hour, reaching the valley floor in less than seven minutes. The rapid rise of rivers in the affected valleys was reported to have reached as much as nine meters in just half an hour.
This is not the first time this particular stretch of the Himalayas has experienced such a disaster. A flood in July of the previous year killed nine people and swept away a border bridge after heavy rains caused the Lhende and Bhote Koshi rivers to overflow their banks. The Langtang region was also severely damaged by an avalanche during Nepal's 2015 earthquake, which destroyed the village of Langtang itself.
The mountains around Langtang are warming at an extraordinary rate, with land above 4,000 meters in the Langtang catchment warming at roughly five times the global average since the 1960s, according to research led by Bethan Davies, chair in glaciology at Newcastle University. This warming trend has intensified over the past decade, contributing to the increased frequency and severity of such disasters.
One of the reasons for this rapid warming is the disappearance of snow and ice, which expose darker rock underneath. This rock absorbs more heat from the sun, further warming the mountain and making disasters more likely. Across the wider Himalayan region, the rate of ice loss from glaciers has doubled since 2000, according to Ella Gilbert, a climate scientist at the British Antarctic Survey.
"We know that climate heating is destabilizing glaciers in the Himalayas," Gilbert said. "When glacier stability is undermined, sudden failures can occur, leading to horrible incidents like this one."
Dr. Davies also pointed to the thawing of permafrost as a contributing factor. "Permafrost is like the 'glue' that holds rocks together," she explained. As the ground warms and the glue melts, steep slopes become progressively less stable.
The Intergovernmental Panel on Climate Change has said with high confidence that declining glaciers, snow, and permafrost are already destabilizing mountain regions worldwide, and that events like this week's collapse are likely to become more frequent as the climate continues to warm.
However, experts are not yet connecting this specific disaster to climate change. "We don't know exactly what happened here," Dr. Gilbert said, "but it's likely that some combination of these factors was at play, and we know that all of these are enhanced by climate change."
The question of why some communities had time to escape while others did not remains a central concern. Hannah Cloke, professor of meteorology, is among those investigating this aspect of the disaster.
As the world watches the unfolding tragedy in Nepal, the incident serves as a stark reminder of the potential consequences of climate change and the urgent need for action to mitigate its effects.
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