Umesh Haritashya

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  • Professor of Earth, Environment and Sustainability, and Director of Sustainability Programs, University of Dayton
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.

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