Accelerating Glacier Loss In The Hindukush Himalaya And Its Regional Implications

Context

The article highlights findings from an ICIMOD report on glacier changes in the Hindukush Himalaya between 1990 and 2020, focusing on accelerating ice loss and its implications.
Source: World Water Day 2026: Ice-loss rate in the Hindukush Himalaya doubled since 2000, says ICIMOD, Down To Earth

Overall Area Loss: HKH lost 12 per cent of its total area between 1990 and 2020
Ice Reserve Decline: 9 per cent reduction in total ice reserves during the same period
Acceleration Trend: Rate of glacier loss increased significantly after 2010
Regional Concentration: Eastern and central HKH experienced the most substantial losses
Vulnerability Factor: Smaller glaciers were disproportionately affected

Critical Role Of HKH: Largest concentration of snow and ice outside polar regions, hence called the Third Pole
River System Dependence: Source region for multiple major river basins sustaining ecosystems
Ganga Basin Loss: Approximately 21 per cent glacier area reduction over three decades
Brahmaputra Basin Loss: Around 16 per cent reduction in glacier area
Eastward River Basins: Yellow (22 per cent), Yangtze (23 per cent), Salween (33 per cent) glacier loss

Water Availability Uncertainty: Glacier retreat directly impacts long-term water supply reliability
Hazard Exposure: Increased risks of glacial lake outburst floods (GLOFs), avalanches, landslides, and debris flows
Downstream Vulnerability: Rising risks to communities and infrastructure dependent on glacier-fed systems
Interlinked Security Risks: Food, water, energy, and livelihood security closely tied to glacier stability

Regional Extent: High-altitude region spanning over 55,000 sq km across eight countries
Glacier Inventory: Contains more than 60,000 glaciers
Ice Volume: Holds nearly 6,000 cubic km of ice reserves
River Basins: Source of 10 major river systems

Himalayas Overall: Lost more than 17 per cent of glacial area between 1990 and 2020
Central Himalaya: Highest loss exceeding 20 per cent, spanning Shimla to eastern Nepal
Western Himalaya: Loss of around 12 per cent (Kashmir to Shimla)
Eastern Himalaya: Around 17 per cent loss (Bhutan, eastern India, parts of China and Myanmar)
Karakoram Exception: Only about 2 per cent glacial area loss, among the lowest in the region

Hindu Kush Himalaya River Systems

Regional Significance

Source Region: The Hindu Kush Himalaya (HKH) forms the origin of 10 major river systems across Asia
Population Dependence: These basins support nearly 1.9 billion people, representing about one-fourth of the global population
Ecosystem Role: Provide essential water resources and sustain diverse ecological systems across multiple countries

Major River Basins (West to East)

Amu Darya Basin: Originates in the Pamir and Hindu Kush ranges and flows across Afghanistan and Central Asia
Indus Basin: Extends across Afghanistan, China, India, and Pakistan; exhibits very high dependence on glacier and snowmelt (around 80 per cent)
Tarim Basin: An inland basin in China with significant reliance on glacial melt (about 40.2 per cent)
Ganga Basin: Flows through India and Bangladesh; among the most densely populated river basins globally
Brahmaputra Basin: Known as the Yarlung Tsangpo in Tibet; flows through China, India, and Bangladesh
Irrawaddy Basin: Located mainly in Myanmar; serves as the country’s primary river system
Salween Basin: Also called the Nu River in China; flows through China, Myanmar, and Thailand
Mekong Basin: Known as the Lancang in China; a major transboundary river in Southeast Asia
Yangtze Basin: Upper course known as Jinsha; the longest river in Asia
Yellow River Basin: Also called Huanghe; the second-longest river in China

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