
Drones join the climb to save Everest
Mount Everest. Mário Simoes/CC BY 2.0 Human waste, empty oxygen cylinders, kitchen leftovers and discarded ladders. Sherpas working on Mount Everest carry all that and more — 20kg/person — navigating a four-hour hike that traverses crumbling glacial ice and treacherous crevasses to bring trash back to base camp. During the most recent climbing season, they…