(FOXNEWS) — Mount Everest has a plumbing problem.

The current “biggest” threat to climbers on the world’s tallest peak, the former head of the Nepal Mountaineering Association said, is the staggering amount of human excrement being left on its slopes — with some estimates putting that number at more than 17,000 pounds for this season alone.

“The biggest problem and concern now on Everest is human waste,” Ang Tshering told the Associated Press in an interview this week. “Hundreds of people are there for weeks who go to open toilets.”

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