Tending to his fields one crisp winter morning, Chandra Singh Rana saw what looked like smoke emerging from the wooded slopes and snow-capped peaks that led to Nanda Devi, one of the world’s tallest mountains.

The accompanying roar sent the 77-year-old, his grandson and fellow residents of Reni, a village nestled up in the Indian Himalayas, scrambling for higher ground. A rockslide in the nearby mountains triggered a tsunami of water, stones and mud that hurtled through the steep river valley dividing the village, consuming those unable to escape.

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