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Visitors look at art made from trash collected on Mount Everest, commissioned for the "Mt. Everest 8848 Art Project" in Kathmandu on November 19, 2012. PRAKASH MATHEMA/AFP/Getty Images
Discarded oxygen and cooking gas cylinders, ropes, tents, glasses, beer cans, plastic and even the remains of a helicopter were used to make 74 artworks under the project. PRAKASH MATHEMA/AFP/Getty Images
Artist Nara Bahadur BK hammered tin cans to create this yak's head. BK says he picked the animal for his artwork because of its usefulness to trekkers. PRAKASH MATHEMA/AFP/Getty Images
This boat by artist Sushma Shakya was made by using tin cans, rods, nails and a portable gas stove. PRAKASH MATHEMA/AFP/Getty Images
A visitor walks past an artwork made with an oxygen cylinder and plywood. PRAKASH MATHEMA/AFP/Getty Images
A picture taken on February 6, 2012 shows an aerial view of the Mount Everest range, some 140 km (87 miles) northeast of Kathmandu. PRAKASH MATHEMA/AFP/Getty Images
In this photograph taken in May 2001, Japanese mountaineer Ken Noguchi (L) and South Korean mountaineer Lee Sang-Bae (R) display garbage collected from Mt. Everest during their cleaning expedition. They had brought back more than 1.7 tons of garbage from the trip. DEVENDRA M SINGH/AFP/Getty Images