Glacial lake outburst floods: The danger sitting above India’s Himalayan valleys

• A 'GLOF' happens when water held back by a glacier or a wall of rock and debris suddenly breaks through.
India’s Himalayas hold at least 7,500 glacial lakes. Early warning systems are going up at about 200 of them.
A 2023 study put 15 million people at risk worldwide, mostly in China, India, Nepal, Pakistan and Peru.
In Sikkim in October 2023, a glacial lake burst and at least 77 people were killed.

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