A geoscientist named Jakob Steiner described a glacier in Nepal’s Himalayas as if it had been sliced by a knife, leaving a massive gap. The resulting ice, rock, and sediment avalanche descended 1.2 km from a 5,000-meter elevation, temporarily blocking the river and forming a lake. When the lake filled and breached, it unleashed a destructive flood that inundated villages on both sides of the border. The calamity led to at least 579 fatalities, with 1,400 individuals missing, including 32 Canadians.
Indigenous locals had long warned about the mountain, Langtang Lirung, as an unpredictable one, a caution that has proven true repeatedly. While some climate scientists are cautious about attributing this disaster solely to human-induced climate change, experts studying glacier hydrology and global warming’s impact on the cryosphere have long anticipated such catastrophic events, particularly in the Himalayas.
John Pomeroy, director of the University of Saskatchewan’s Centre for Hydrology, emphasized the increasing frequency of such catastrophic events due to climate change rapidly eroding natural infrastructure. The warming temperatures, largely caused by fossil fuel emissions, have severely impacted the mountain region, altering precipitation patterns, accelerating glacier retreat, and triggering more frequent avalanches.
Manjueet Dhakal, a climate scientist, highlighted the complexities of the Himalayas and the significant glacier loss due to global warming. The region, with over 63,000 glaciers, is experiencing profound changes, including permafrost thawing, crucial for mountain stability. The catastrophic events in Nepal are a wake-up call to the escalating risks associated with glacier-related disasters globally.
Glacial Lake Outburst Floods (GLOFs), like the recent one in Nepal, have become a more imminent threat due to global warming causing increased ice loss and growing glacial lake volumes. The vulnerability of communities in mountain regions like the Himalayas to such disasters is exacerbated by their close proximity to glacier-fed streams and rivers.
Steiner emphasized the role of past decisions and the need for better preparation and early warning systems to prevent such disasters. Collaborations across borders are essential, as seen in the challenging cooperation required between Nepalese and Chinese authorities in trans-boundary areas like the Nepal-Tibet border. To mitigate future disasters, monitoring, warning systems, and urgent global efforts to limit further warming are crucial.
The recent catastrophe underscores the urgency for worldwide action to reduce greenhouse gas emissions and combat climate change. Rather than solely relying on adaptation, efforts must focus on curbing global warming to prevent catastrophic events that devastate communities and ecosystems.