Popular Alaska peak weighs new rules for climbers’ poop
ANCHORAGE, Alaska — Climbers on North America’s tallest mountain may have to start packing out more of their poop after a researcher determined a glacier in which much of it has been dumped over the past decade probably is not decomposing the human waste.
Michael Loso, a glacier geologist, calculates that 36,000 climbers between 1951 and 2012 deposited 152,000 to 215,000 pounds (69 to 97 metric tons) of feces onto Kahiltna Glacier, part of the most popular route to Denali’s summit.
For more than a decade, the National Park Service has required that climbers keep waste off the Alaska mountain’s surface. Mountaineers captured their poop in biodegradable bags held by portable toilets and pitched it into deep crevasses on the glacier.
However, Loso’s research indicates human waste never reaches the bottom of the glacier, will never be exposed to extreme temperatures and disintegrate, and likely will reappear downstream as stains on Kahiltna Glacier’s surface where melting exceeds annual snowfall.


