The World is Heading Toward an Era of Snowless Mountains

On many of the world’s mountain peaks, ice that has endured for thousands of years is now on the brink of disappearance. Not in centuries, but in decades. A recent study published in the journal Nature Climate Change, December 2025 shows that the world is approaching a period in which small mountain glaciers will vanish at the fastest rate in human history as global warming continues.

The research introduces the concept of “peak glacier extinction,” a period when the number of glaciers disappearing each year reaches its highest level. Based on global climate modeling, that peak is expected to occur in the mid-21st century, roughly between 2041 and 2055. During this window, thousands of small glaciers worldwide are projected to disappear annually.

“The most vulnerable glaciers are the small ones in mountain regions,” said Fabien Maussion, one of the study’s authors and a glaciologist involved in global glacier modeling. “These glaciers contain little ice, have a large surface area exposed to heat, and are extremely sensitive to temperature changes.”

First Victim

Unlike the massive ice sheets of Greenland and Antarctica, most of the world’s glaciers are small and located in mountain ranges. They are numerous—more than 200,000 globally—but hold only a small fraction of Earth’s total ice. It is precisely their small size that makes them the earliest casualties of a warming climate.

The study combines the World Glacier Inventory with three independent global glacier models, simulating glacier responses under various warming scenarios ranging from 1.5 degrees Celsius to 4 degrees Celsius above pre-industrial levels. Across all scenarios, the results are consistent, small glaciers disappear faster and earlier than large ones.

Even under the lowest warming scenario of 1.5 degrees Celsius, glacier extinction rates are projected to peak in the middle of this century. The difference is scale. Fewer glaciers are lost overall at lower warming levels, while higher warming dramatically accelerates losses. In the worst-case scenario, approaching 4 degrees Celsius of warming, as many as 4,000 glaciers per year could vanish at the peak.

The researchers stress that peak extinction does not mean the end of all glaciers. After this period, the annual number of disappearing glaciers declines—not because conditions improve, but because most small glaciers have already disappeared. What remains are larger, thicker glaciers that take far longer to melt completely.

For mountain regions, the implications are immediate and tangible. The European Alps, for example, are expected to lose nearly all of their small glaciers within the coming decades. Similar patterns are projected for the Andes, the Rocky Mountains, the Caucasus, and tropical regions such as Papua and East Africa, where glaciers exist at extreme elevations yet remain highly vulnerable to rising temperatures.

“For many mountain ranges, the middle of this century may mark the end of small glaciers,” Maussion said. “This is no longer an abstract projection. It is something already unfolding.”

The loss of small glaciers extends far beyond changes in scenery. In many regions, glaciers act as seasonal water buffers, slowly releasing meltwater during dry periods. When glaciers disappear, water flows become more erratic—surging briefly before declining more rapidly—threatening water supplies for millions of people downstream.

Impact of Social and Culture

The social and cultural consequences are also significant. In many mountain communities, glaciers hold spiritual meaning and serve as symbols of local identity. Their disappearance is often seen not only as an environmental crisis, but as the loss of cultural heritage and historical continuity.

The study underscores that glacier extinction rates remain highly dependent on human choices today. Every fraction of a degree of avoided warming can spare thousands of glaciers from complete disappearance. While some small glaciers have already crossed a point of no return, many others could persist longer if greenhouse gas emissions are sharply reduced.

“The difference is real,” Maussion said. “A world that warms by 1.5 degrees Celsius will look very different from one that warms by 3 or 4 degrees, especially in mountain regions.”

Researchers caution that the disappearance of small glaciers often receives less public attention than dramatic events involving massive ice sheets. Yet collectively, their loss could have equally profound consequences, particularly for mountain ecosystems and the people who depend on them.

If current warming trends continue, the mid-21st century may be remembered as the period when the world entered a new era—one in which small glaciers atop mountain peaks, once considered permanent, became memories within a single human generation. (Sulung Prasetyo)