Nepal-China floods highlight a growing front of the climate change crisis

On August 26, a section of glacier collapsed at an altitude of more than 5,000 metres on the Nepalese side of the Himalayas. The falling ice and rock accelerated down a steep valley at about 50 metres per second, scouring debris and transforming into a high-speed mudslide that slammed into Gyirong Port on the Chinese side just seven minutes later. The force of the flow largely buried and obliterated the border facilities. Hundreds of people, many of them travellers, remain missing on the Chinese side. Across the border in Nepal, entire villages were swept away, leaving hundreds dead and thousands unaccounted for. For decades, the defining image of climate vulnerability has been the low-lying island nation, where rising seas threaten to erase entire communities from the map. That threat is real, urgent and unfinished business. However, the catastrophic mudslide that tore through the China-Nepal border forces us to look beyond the waterline and consider a more complex, multidimensional map of climate risk. The iconic risk remains sea-level rise. It is slow, inexorable and already under way. Coastal megacities from Shanghai to Mumbai to New York are investing heavily in sea walls and surge barriers. Small island states are exploring relocation treaties and purchasing land abroad as a form of climate insurance. The very predictability of this threat has allowed societies to develop institutional responses. The second most immediately felt climate risk is extreme rainfall and the catastrophic flooding it brings. For several years, traditionally drier places such as Beijing and large swathes of inland China have suffered disastrous floods that overwhelmed infrastructure, affecting millions and exposing the limits of urban drainage systems never designed for the intensity of rain now falling from a warmer atmosphere. The third risk is drought. This summer, a severe and persistent drought, coupled with record-breaking heatwaves, created a crisis across much of Europe. The prolonged lack of rainfall pushed major waterways, including the Rhine, Danube and Loire, to historically low levels, disrupting river transport and forcing cargo vessels to reduce their loads. France alone faces an estimated €10-15 billion (US$11.6-17.4 billion) in heat-related losses and a projected 35 per cent drop in maize yields. Across Europe, low river levels and wildfires have exposed unexploded ordnance from World War II that had long been submerged or buried – another stark reminder of how climate change is already profoundly affecting our lives. The Gyirong disaster has brought a fourth threat into terrifying focus. Scientists call these events “cryo-hydrological hazards” – disasters born from destabilised ice, snow and meltwater in rapidly warming high mountain regions. The high-altitude China-Nepal border region, which has long been valued by travellers for its dramatic ice-covered peaks, is warming significantly faster than the global average. Since 1981, the number of snow-cover days in southern Tibet has fallen by an average of 12.36 days per decade. Between 1985 and 2020, the Qinghai-Tibet Plateau lost roughly 18 per cent of its glacier area. The cascade was a classic cryo-hydrological disaster chain: a high-altitude glacier fracture triggered an ice-rock avalanche that rapidly evolved into a high-speed debris flow. Travelling roughly 22 kilometres in minutes, the mudslide slammed into Gyirong Port and largely levelled the border facilities. The extreme speed left virtually no window for early warning. This is not a one-off. In 2022, a glacier collapse on Italy’s Marmolada peak killed 11 climbers. In 2025, a rockslide and ice collapse in the Swiss village of Blatten claimed a life even after the area was evacuated. The Alps, like the Himalayas, are becoming increasingly unstable as permafrost thaws and glaciers retreat. Europe is among the fastest-warming continents. Mountain communities now face a threat that is sudden, catastrophic and often virtually unpredictable. The Gyirong disaster shows that a warming planet also thaws permafrost and forces ice to retreat, removing the structural “glue” that once held together steep mountain slopes. A warm spell, heavy rain or minor tremor can now produce far more destructive outcomes than a generation ago. For mountain communities across the Hindu Kush Himalayas, the Alps, the Southern Alps of New Zealand, and Alaska, this is a daily reality. The question is whether we can expand our imagination of climate vulnerability to include the valleys below the falling mountains. Yet even as these cascading hazards multiply and claim lives without regard for nationality or ideology, the world remains consumed by interstate enmity. In the face of a planetary crisis that respects no borders, why do we still pour so much energy into rivalry rather than shared resilience? The world has spent decades preparing for the ocean to rise. It is time we also prepare for the mountains to fall and recognise that the real enemy is the one that threatens us all.

Nepal-China floods highlight a growing front of the climate change crisis

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Rising sea levels, extreme weather and drought all remain concerns, but destabilised ice and snow at high altitudes is increasingly a threat

Rising sea levels, extreme weather and drought all remain concerns, but destabilised ice and snow at high altitudes is increasingly a threat