Hikers and climbers are being forced to clean up their waste in Alaska as 66 tons of frozen faeces is expected to start thawing - thanks to global warming.
As climate change melts the glacier's icy surface, the National Park Service (NPS) is preparing for a potential avalanche of human waste heading for the ocean.
Six of the seven hiking companies contracted to take tourists up Mount Denali's trails have volunteered to enforce a waste management program, according to the NPS,
This waste brings with it a trove of parasites, diseases, bacteria and residual toilet paper, which is travelling towards Alaska's coast.
Since the 1970s park rangers needed to accommodate increasing numbers of climbers by digging latrines into the glacial ice near crowded stopping points.
The 10 foot (three metre) hole was covered was filled in at the end of climbing season, but melting ice could reveal the excrement buried within.
Hikers are now being asked to take a personal transportable toilet, called the Clean Mountain Can, with them on their expedition.
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Hikers and climbers are now being forced to clean up their waste at Denali mountain in Alaska as 66 tons of frozen faeces is expected to start melting. As global warming melts the glacier's icy surface, the National Park Service is having to prepare. Here, the Clean Mountain Can
The slogan on the can, reading 'no can, no climb', has been adopted by six of the seven guide companies contracted on the mountain.
Every climber is handed a can on arrival and expected to use it. The toilet can be used around 12 times and weighs up to 15 pounds (7kg) when full.
The guide companies that lead many of the 1,200 climbers who attempt the summit each year.
Previously, going up Denali's climbing route each year would defecate wherever they could.
Experts are now fearing that a whopping 66 metric tons of faecal matter has accumulated in Kahiltna Glacier's ice over the decades.
'Climbers and particularly guide services are really embracing the new policy and are even exceeding it. It has become kind of an informal badge of merit to carry off all your waste,' said Michael Loso, a National Park Service glaciologist.
Mr Loso has been studying the problem of climber waste on the mountain for nearly a decade.
The first steps towards improving sanitation took place in 2001, when the NPS worked with the American Alpine Club to pilot the cup program.
More than 500 climbers used the can over the following years, reducing contamination near one of the more disgusting campsites enough to show the program's merit.
Since it can take a few weeks to trek up and back, park rangers admitted that they couldn't expect walkers to carry an entire trip's worth of waste the whole way.
So they compromised on a sign-posted crevasse at 14,200 feet (4,328m) where hikers could drop their faeces.
