Decades of commercial mountaineering have turned Mount Everest into the world’s highest rubbish dump as an increasing number of big-spending climbers pay little attention to the ugly footprint they leave behind. Fluorescent tents, discarded climbing equipment, empty gas canisters and even human excrement litter the well-trodden route to the summit of the 8,848-metre (29,029-foot) peak. “It is disgusting, an eyesore,” Pemba Dorje Sherpa, who has summited Everest 18 times, told […]