Climber Jake Meyer talks about Everest's poo problem
Too much poo and wee is being left behind by climbers on Mount Everest, the world's highest mountain.
It's causing pollution and could spread disease, says the boss of Nepal's mountaineering association.
Ang Tshering wants Nepal's government to ask climbers to get rid of their waste properly.
He says poo and wee have been "piling up" for years: "Climbers usually dig holes in the snow for their toilet use and leave the human waste there."