KATHMANDU (AFP) - An environmental group is asking the Nepal government to consider installing portable toilets on Mount Everest for climbers caught short at the roof of the world. Eco Himal says the thousands of trekkers who set off from the South Base Camp in Nepal each year would do a better job of keeping the place clean if they and their porters had somewhere civilised to go when nature called. Human waste is a problem, of course, said the groups director, Phinjo Sherpa. I am merely suggesting that if we have public toilets they can be used. Many groups bring expedition toilet cans, but Phinjo Sherpa said porters were often left with little choice but the nearest snowdrift. Environmental activists say Everest is littered with the detritus of past expeditions, including human waste and mountaineers corpses, which can take decades to decompose because of the extreme cold. Phinjo Sherpa said installing the toilets would be discussed as part of a wider waste management plan being prepared by the government that would encompass popular peaks throughout the Everest region. If there could be two or three toilets that would be good but this is just at the planning phase. We will have to decide what is a good idea and what isnt, he said. However, the idea has been rejected by some of Eco Himals partners within the Nepal-based climbing community. The ice moves around a lot during the year. If you built toilets at the base camp, the ice would shift and the structures would fall down, said Wangchhu Sherpa, president of the Everest Summiteers Association. Climbers spend tens of thousands of dollars trying to reach the 8,848-metre (29,028-foot) summit of Everest, but campaigners say few pay much attention to the rubbish they leave behind. There is no official figure on how much trash has been left on the mountain, but the debris of 50 years of climbing has given Everest the name of the worlds highest dumpster.