Tshiring Jangbu Sherpa cannot forget the dead body he saw just metres from the summit of Mount Lhotse in the Himalayas more than a decade ago. The Nepali was working as a guide for a German climber trying to scale the world’s fourth highest mountain in May 2012. The body blocking their path was thought to be Milan Sedlacek, a Czech mountaineer who’d perished just a few days earlier. Mr Sherpa was curious why the Czech climber had died so close to the top. One of the gloves on the frozen corpse was missing. “The bare hand might have slipped...