Due to extreme low temperatures, shit left on Everest is frozen and does not degrade.
"There is hardly any ice and snow, so you will see human shit all around," Mr Keck says.
Although no official figure exists, his organisation estimates that there are around three tonnes of human shit everywhere between camp one at the bottom of Everest and camp four, towards the summit.
https://www.bbc.com/news/world-asia-68237123