In total since 1953 on Mount Everest was visited by about a thousand thousand Europeans. And each of them left garbage after themselves: excrement, broken equipment, palathes and other household garbage, like cellophane bags. Unlike landfills “below”, the left organic garbage at such a height does not decompose and Climbers will forever remain on Everest- the cold and discharged air interfere.
Nepal and Tibet are trying to deal with landfills on the mountain – they will encourage mountaineers to pay money if they bring the garbage from the mountain (including excrement). But this promotion system does not work so efficiently – the price for climbing can exceed $ 100,000, whereas for garbage pay only $ 100 per kilogram.
There is an international project Mount Everest Biogas Project , which came up with how to process biological waste into methane (you can support it).