O-Young recalls one experience during his climb on Mt. McKinley in which an American climber brought along a special bag to collect his human waste until a suitable site could be found to dispose of it .. He ultimately accumulated nearly 20 kg of excrement over several days befor getting rid of it. "Leave nothing except footprints, take nothing except photographs, kill nothing but time."
他還提及在今年攀登麥肯尼峰途中，一個美國人因為找不到冰河裂隙處理糞便，只好一直帶著他積存了許多天，重達二十公斤的大便袋（裝排泄物的袋子），執意的尋找冰河裂隙丟棄，「除了腳印，不留任何痕跡；除了照片，不取一草一物；除了殺時間，不獵殺任何生物。」