Sixteen people were killed last week in an avalanche on Mount Everest. The dead were all Sherpas, the Nepali guides who lead climbers attempting to summit the world’s highest peak. Now, many Sherpas have left the mountain, bringing an end to climbing season. Casey Henley teaches in the expeditionary studies program at SUNY-Plattsburg and has guided on Everest. He says Sherpas shoulder a particularly high burden.