Mountain climate shift puts billions at risk

Tuesday 25 November 2025 - 14:20

By: Dakir Madiha

Mountain climate shift puts billions at risk

Mountain regions are now warming faster than the rest of the planet, disrupting water supplies, destabilising slopes and putting both local communities and billions of downstream residents at growing risk.

Climate change in the mountains

A major international review of “elevation dependent climate change” finds that temperatures in mountain regions have been rising more quickly than in nearby lowlands, especially since the 1980s. As snow and ice retreat, more dark rock and soil are exposed, absorbing additional heat and accelerating local warming cycles in high altitude zones.

Scientists warn that these changes mirror trends seen in the Arctic, with high mountains losing snow and ice rapidly and experiencing profound shifts in temperature, precipitation and ecosystems. The review concludes that this enhanced warming is likely to continue through this century, although detailed projections are limited by sparse observation networks in remote, high elevation environments.

Immediate dangers and recent disasters

More than one billion people already rely on mountain snow and glaciers as natural reservoirs that feed rivers supplying drinking water, irrigation and hydropower, including in China and India where meltwater from the Himalayas underpins water security for hundreds of millions. As warming pushes precipitation from snow toward rain, the short term risk of flash floods and destructive river surges increases, even as long term water storage in ice and seasonal snow declines.

Recent events illustrate the danger. Pakistan has endured deadly monsoon seasons with intense mountain cloudbursts and extreme rainfall killing large numbers of people in highland and downstream communities, while Switzerland has recorded another year of severe glacier melt, losing about three per cent of glacier volume in 2025 alone and a quarter of its ice in the past decade. In May, a catastrophic rock and ice avalanche destroyed most of the Swiss village of Blatten, highlighting how destabilised slopes and thawing ice can turn into sudden disasters.

Ecosystems under pressure

Rising temperatures are forcing plant and animal species to shift upslope in search of cooler refuges, compressing entire ecosystems into shrinking high altitude zones. Scientists warn that many species will eventually run out of mountain, leading to local extinctions and a wholesale reshaping of alpine and subalpine habitats.

These ecological shifts weaken the natural services mountain landscapes provide, from stabilising soils and regulating water flow to supporting agriculture, tourism and cultural practices. Researchers stress that maintaining functioning ecosystems in high mountains is essential to preserve their role as global “water towers” and to reduce disaster risks for communities from the Andes and Alps to the Himalayas.

Data gaps and policy implications

Despite growing evidence, large areas of the world’s mountains remain under monitored, with few long term weather and climate stations above key elevation thresholds. This lack of data makes it harder to track local warming trends, forecast hazards and design targeted adaptation measures for vulnerable regions.

Scientists and mountain researchers are calling for urgent investment in monitoring networks, risk mapping and adaptation strategies that link local mountain communities with the billions of people living downstream. They emphasise that protecting mountain regions cannot be separated from global efforts to cut greenhouse gas emissions, since continued warming will further accelerate glacier loss, water stress and disaster risks in these critical environments.