Talking Climate · The Wilkes Center for Climate Science and Policy

26: Sizing Up the Melting Glaciers of the Himalayas

·29 min·1 clip

From 1950 to 1980 the glaciers showed positive mass balances, but after 2000 the melting accelerated significantly.

Glaciers make the water story less theoretical. Ross Chambliss opens on the Hindu Kush Himalayas as a system where an estimated 54,000 glaciers feed rivers, farms, freshwater supplies, and energy downstream. The scale lands fast: 60,000 square kilometers of ice, with the Indus River system getting as much as 40 percent of its water from those glaciers. Smriti Srivastava brings the field side of the work. She talks through glacier inventories, expeditions, climate records, and hydrological models, all trying to answer a stubborn question: how much ice is being gained or lost? The answer is messier than a clean chart. Different inventories give different area, volume, and mass estimates, so glacier-by-glacier projections can get shaky. Chambliss keeps the mechanics understandable, restating mass balance as the net result of accumulation and melting. That once had a narrower rhythm. Srivastava says a 1950-to-present temperature and precipitation series, paired with models, helps assess it. Some years can still come out positive, but recent melting has picked up. ERA5 and climate projections help extend the analysis, though high-resolution products can still miss at very small scales. The worry is practical, not theatrical. More than a billion people depend on these systems in some way. Srivastava stays calm about it, but not casual: better responses need local assessment and local solutions, not just broad alarm.

As heard by us

A careful look at Himalayan melt, river dependence, and the uncertainty built into glacier measurements.

The episode treats Himalayan glaciers as a water source first and scenery second. Ross Chambliss lays out the scale with the estimated 54,000 glaciers in the Hindu Kush Himalayas, their 60,000 square kilometers of ice, and the claim that they supply as much as 40% of the Indus…

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Why Himalayan glacier melt matters for rivers that feed more than a billion people downstream.

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