The Himalayas are melting faster - and India's economy is 'at risk'
A new report finds Himalayan glaciers are losing mass roughly 65% faster than a decade ago, based on research by the consultancy Systemiq, produced with the Integrated Mountain Initiative and technical inputs from the International Centre for Integrated Mountain Development (ICIMOD) and the GB Pant National Institute of Himalayan Environment.
Only about 21 of an estimated 40,000 glaciers across the Himalaya-Karakoram region are monitored in sustained, detailed fashion, leaving a major data gap on the pace of melt.
The report estimates that roughly a third of Himalayan glacier melt is driven by black carbon (soot), much of it originating from brick kilns on the plains, which settles on snow and ice and increases sunlight absorption.
India's government has classified 56 glacial lakes as "very high risk" following a 2025 risk assessment covering 189 high-risk lakes, out of thousands being tracked across Himalayan river basins.
The report proposes ten priority transitions — including cutting black-carbon emissions, expanding glacier monitoring, strengthening disaster early-warning systems, and rethinking mountain tourism — to manage the risk.
Glacial Lake Outburst Floods (GLOFs) and India's Institutional Response
A Glacial Lake Outburst Flood (GLOF) occurs when a lake formed by glacial meltwater — often dammed by unstable ice or loose moraine — breaches suddenly, releasing a large volume of water and debris downstream with little warning. As Himalayan glaciers retreat faster, more such lakes form and grow, raising GLOF risk in river valleys below.
Key Details
- The South Lhonak Lake GLOF in Sikkim (October 3-4, 2023) is India's most-cited recent case: a landslide-triggered lake breach sent a flood down the Teesta valley, destroying the Teesta-III hydropower dam at Chungthang and killing over 55 people, with dozens more reported missing.
- The Central Water Commission monitors glacial lakes exceeding 10 hectares across Himalayan river basins — the report cites roughly 2,485 such lakes.
- Following the Sikkim disaster, the National Disaster Management Authority (NDMA) has pushed for a National GLOF Risk Mitigation Programme, expanding automated weather stations and early-warning systems in high-risk basins.
- GLOF risk is distinct from riverine flooding: it is triggered by moraine/ice-dam failure, landslides, or avalanches into a glacial lake, not by monsoon rainfall alone.
The report's finding that only 21 of 40,000 Himalayan glaciers are actively monitored, against a backdrop of 56 "very high risk" glacial lakes identified by the Indian government, illustrates the exact monitoring gap that let the Sikkim GLOF occur without adequate warning.
National Mission for Sustaining the Himalayan Ecosystem (NMSHE)
NMSHE is one of the eight national missions under the National Action Plan on Climate Change (NAPCC), launched by the Prime Minister's Council on Climate Change on 30 June 2008. It is the dedicated mission for understanding and responding to climate change impacts across the Indian Himalayan Region, covering glaciology, biodiversity, water resources, and adaptation planning for mountain communities.
The report's call to "expand glacier monitoring" as a priority transition maps directly onto NMSHE's stated glaciology and hydrology mandate — the report is effectively flagging that India's existing domestic mission needs significantly scaled-up execution.
ICIMOD and the Hindu Kush Himalaya (HKH) Region as a Transboundary "Water Tower"
The Hindu Kush Himalaya (HKH) is the mountain system stretching roughly 3,500 km from Afghanistan to Myanmar, source of ten major Asian river systems including the Indus, Ganga, and Brahmaputra. Because meltwater and monsoon-fed glaciers here sustain river flow for hundreds of millions of people, the region is often called Asia's "Water Tower" or the "Third Pole" (after the Arctic and Antarctic, for its ice mass).
Key Details
- ICIMOD (International Centre for Integrated Mountain Development) is a regional intergovernmental knowledge centre founded on 5 December 1983, headquartered in Lalitpur, Nepal.
- ICIMOD's eight regional member countries are Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal, and Pakistan.
- The HKH glaciers and snowpack feed rivers supporting an estimated 1.9 billion people across South and Southeast Asia.
- ICIMOD's periodic "HKH Assessment" reports are the standard reference for regional glacier-melt projections cited in Indian and international climate policy.
The 65%-faster melt figure comes from research conducted with ICIMOD's technical input, reflecting ICIMOD's role as the coordinating scientific body for glacier data across the eight-country Hindu Kush Himalaya region that India shares with its neighbours.
Black Carbon as a Short-Lived Climate Pollutant Accelerating Glacier Melt
Black carbon is a fine particulate produced by incomplete combustion (biomass burning, brick kilns, diesel engines, cookstoves) that, when deposited on snow and ice, lowers surface reflectivity (albedo) and increases heat absorption — a mechanism distinct from, and additional to, greenhouse-gas-driven warming. Because it stays in the atmosphere for only days to weeks (unlike CO2, which persists for centuries), it is classified as a "short-lived climate pollutant" (SLCP), making its reduction a fast-acting mitigation lever.
Key Details
- The report attributes roughly one-third of Himalayan glacier melt to black carbon deposition, much of it traced to brick kilns in the Indo-Gangetic plains.
- Black carbon reduction is addressed under India's National Clean Air Programme (NCAP, 2019) and brick-kiln emission norms enforced by State Pollution Control Boards, though it is not yet governed by a dedicated binding national black-carbon target.
- Because SLCPs act on a shorter timescale than CO2, cutting black carbon emissions can produce comparatively rapid reductions in glacier melt rates, distinguishing it from long-term decarbonisation measures.
- India is a member of the Climate and Clean Air Coalition (CCAC), a global initiative on SLCP mitigation.
The report's identification of black carbon (largely from brick kilns) as responsible for a third of glacier melt reframes part of the Himalayan melt crisis as a controllable, near-term regional air-pollution problem rather than only a long-horizon global emissions issue.
- Himalayan glaciers are losing mass approximately 65% faster than a decade ago (Systemiq report with ICIMOD and GB Pant NIHE technical input).
- Only ~21 of an estimated 40,000 glaciers in the Himalaya-Karakoram region are under sustained, detailed monitoring.
- Himalayan territory constitutes about 18% of India's land area but accounts for roughly 35% of the country's disaster incidence.
- Himalayan water systems are estimated to underpin about 20% of India's GDP (via agriculture, hydropower, tea, and pilgrimage-tourism economies), while mountain states themselves capture only about 5% of that value.
- India's government has flagged 56 glacial lakes as "very high risk" out of 189 assessed high-risk lakes (2025 assessment); the Central Water Commission tracks about 2,485 glacial lakes over 10 hectares.
- The South Lhonak Lake GLOF (Sikkim, October 2023) killed over 55 people and destroyed the Teesta-III hydropower dam.
- Roughly one-third of Himalayan glacier melt is attributed to black carbon deposition, chiefly from brick kilns.