Glaciers worldwide are rapidly thinning, with the Hindu Kush Himalaya (HKH) region experiencing the most severe losses due to climate change, retreating 65% faster in 2011-2020 than in the previous decade, according to a new United Nations report released on the World Day for Glaciers.
Spanning five million square kilometers, the HKH region contains around 100,000 km² of glaciers and is often called the "Third Pole" or the "Water Tower of Asia" as it stores more ice and snow than any region outside the Arctic and Antarctic.
The region feeds ten major river systems that support nearly two billion people. If global temperatures rise by 1.5°C to 2°C, glacier volume in the HKH region could decline by 30-50% by 2100, and if warming exceeds 2°C, it may lose 45% of its 2020 glacier volume.
Stretching over 3,500 kilometers across eight countries—Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal, and Pakistan—the HKH mountains sustain 240 million residents, with 1.65 billion more depending on their waters for drinking, agriculture, hydropower, and ecosystem services.
According to the UN World Water Development Report 2025, if temperatures rise between 1.5°C and 4°C, mountain glaciers worldwide could lose 26-41% of their total mass by 2100 compared to 2015 levels.