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US Edition - Today's top story: When a mountain falls: How ice and rock triggered Nepal’s catastrophic flood – and why climate change is raising the risks

August 31, 2026

US Edition

The Conversation
 

Top headlines

Lead story

The magnitude of the flood disaster that swept through villages in Nepal and Tibet on Aug. 26 is hard to comprehend. You can see that in the eyes of people rescued from the muddy water.

Disasters like this have hit the Himalayas repeatedly in recent years. To understand why, we turned to University of Dayton geologist Umesh Haritashya. He’s part of an ad hoc group of experts in high mountain geology and natural disasters who quickly analyze satellite images and other data to help communities respond.

Haritashya traces the latest disaster back to a mountaintop glacier near the Tibet-Nepal border. He explains what happened there to trigger the catastrophic flood, and why the water rose again a couple days later. He also describes the ways rising temperatures, melting permafrost and growing glacial lakes are increasing the hazard risk in mountain regions around the world.

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Stacy Morford

Senior Environment + Energy Editor

 
A massive rockfall in the Himalayas led to a surge of flood water than swept through villages, killing hundreds of people, on Aug. 26, 2026. Prabin Ranabhat/AFP via Getty Images

When a mountain falls: How ice and rock triggered Nepal’s catastrophic flood – and why climate change is raising the risks

Umesh Haritashya, University of Dayton

A geologist explains how thawing permafrost and melting ice are increasing the risk of destructive floods in the Himalayas and other high mountain regions around the world.

Ethics + Religion

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Asma Uddin, Michigan State University

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Ilan Stavans, Amherst College

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Science + Technology

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Kimberly Baker, Clemson University

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K. R. Prathyusha, University of Colorado Boulder

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Health + Medicine

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Abigail Witmer, The Ohio State University

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Politics + Society

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Arie Perliger, UMass Lowell

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John C. Besley, Michigan State University

Viewing trust as behaviors, not feelings, can help explain why some heed Aaron Rodgers’ advice over Dr. Fauci’s – and what experts can do about it.

Education

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Suzanne McLeod, Binghamton University, State University of New York; Kathryn Blackman, Binghamton University, State University of New York

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International

A black fungus is thriving in the midst of Ireland’s whiskey boom – we need to know more about it

Jenny Lawler, Dublin City University

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