In 1963 — just 10 years after the first ascent of Mount Everest by Sir Edmund Hillary and Tenzing Norgay, a Sherpa guide -– a fellow climber, Dr. Barry Bishop, wrote in National Geographic that parts of the mountain had become “the highest junkyard on the face of the Earth.” Expedition teams were trashing Everest by wantonly disposing of empty oxygen canisters, torn tents and other rubbish at base camp and just a few thousand feet below the summit, Dr. Bishop reported.
http://green.blogs.nytimes.com/2010/04/22/shouldering-waste-on-the-trek-down-mount-everest/?src=twt&twt=nytenvironment