Climate change

[Note; Cryosphere is solid water, e.g. ice]

International Cryosphere Climate Initiative  -   Rivers are dynamic and evolving. However, between 1980-2000 and 2000-2020, rates of change doubled for key rivers in the Himalayan uplands, sparking questions about the influence of climate change and a rapidly warming cryosphere. Satellite and field observations of over 1,000 river bends show that cryosphere loss is a significant driver to these accelerated river dynamics. Thawing and destabilized riverbanks, increased meltwater, and changes in sediment flow and surrounding vegetation are all shaping new river patterns and ecosystems in the high Himalaya. These changes in river dynamics have significant adaptation implications for water security, agriculture, disaster planning and terrain stability for downstream communities....

The 2025 European State of the Climate report describes rapid and continuing losses of snow and ice across Europe’s cold regions, especially the Arctic, Alps, and Greenland. All monitored European glacier regions recorded net mass loss in 2025, with Iceland experiencing its second-largest glacier loss on record, continuing a long-term trend of glacier retreat across the continent. Europe experienced reduced winter conditions, with fewer areas experiencing frost and ice days. In March, snow cover extent in Europe was about 31% below average, which was the third-lowest since satellite records began in 1983. The report also highlights major losses from the Greenland Ice Sheet, which shed about 139 gigatons of ice during the year, contributing 0.4 millimeters to global sea-level rise. These cryosphere declines are described not only as consequences of warming but also as amplifiers of further climate change, since reduced snow and ice cover increase the amount of sunlight absorbed by the land and ocean, intensifying regional warming and contributing to broader ecosystem, hydrological, and sea-level impacts....

Over the past four decades, Greece’s highest mountains have lost 58% of their snow cover, making this region's snowpack one of the fastest disappearing in the world. Using a new high-resolution snow model based on satellite observations and climate data, researchers found widespread decline in snow cover from November through May each year, with the largest loss at the beginning and end of the snow season, increasing the risk of snow droughts (periods with unusually low snow that threaten downstream water supply). Rising air temperatures were the primary driver of snow loss, influencing both how much winter precipitation falls as snow, and how quickly that snow melts. The study confirmed that these observed losses are primarily driven by human-caused warming. The findings highlight growing risk of snow drought and reduced seasonal water storage in Mediterranean mountain regions that rely on vulnerable snowpack.

Scientists reconstructed the terrain beneath more than 200,000 glaciers worldwide using satellite observations, ice thickness measurements, and advanced glacier modeling, finding that over 50,000 new lakes could emerge as glaciers retreat. Together, these future lakes would store about 3,100 cubic kilometers of water – equivalent to roughly 7 millimeters of sea-level rise.  Large potential lakes near glacier fronts in High Mountain Asia were identified as a key concern because they would increase the risk of glacier lake outburst floods, where water suddenly escapes from lakes dammed by ice or rock. 

The study also estimated that Earth's remaining glaciers, including those in polar regions (but not the Greenland and Antarctic ice sheets) currently contain enough ice to raise global sea levels by about 0.3 meters if fully melted.