But did they clean up after?
One of the stories from Raoul's link.
Appalled climbers and an alarmed Nepalese government keep trying to clean up the mountain, both for esthetic and public-health reasons. (The vast quantities of excrement climbers have left behind could contaminate glacier-melt water in Nepal, India and Bangladesh.) Expeditions now pay a refundable garbage deposit and must bring along a conservation officer; human waste is removed in barrels, and this spring workers carted down 10 tons of rubbish.