Nepal plans to use unmanned drones to move trash from the top of Mount Everest.DOMA SHERPA/Getty ImagesSherpas will soon use drones to remove trash from Mount Everest's slopes.Everest's peak has become a massive garbage dump with 50 metric tons of waste annually.Chinese drone manufacturer DJI developed the "heavy lifter" high-altitude drones.Mount Everest looks more like a landfill every year as crowds of adventurous climbers flock to its slopes.Visitors have left an estimated 50 metric tons of waste on Everest.