A few years ago, Kami Rita Sherpa, a veteran climber and guide, met with a gruesome sight at Mount Everest Base Camp. Human bones poked from the ground, smooth and ice-crusted.

It was not a fluke. Subsequent seasons yielded more remains — a skull, fingers, parts of legs. Guides increasingly believe that their findings fit into a broader development on the world's highest mountain: A hotter climate has been unearthing climbers who never made it home.

"Snow is melting and bodies are surfacing," said Sherpa, who has summited Everest 24 times, a world record. "Finding bones has become the new

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