Today, Mount Qomolangma's peak is not a lonely place any more. Over 3,500 people have (successful) climbed the mountain over the past years. Meanwhile, climbers have complained about (wait) for hours in the bottlenecks.
In fact, the dangerous (crowd) aren't the only problem. All those climbers need to bring a lot of gear（设备），much of which ends up (leave) on the mountain. It is becoming the world's (tall) rubbish dump.
But the good news is some mountaineers have started to clean up Qomolangma. Mountaineers Paul and Eberhard are part of Eco Everest Expedition, which has been cleaning up rubbish since 2008. So far they (collect) over 13 tons of garbage.
Some of that rubbish is even being used for higher purpose. As part of the Mount Everest 8848 Art Project, a group of 15 artists from Nepal collected 1.5 tons of garbage. They've changed the cans and oxygen tanks 74 pieces of art that have already been exhibited in Nepal's capital. Part of the profit from sales (be) available for the Everest Peakers Association which has helped collect rubbish off the mountain.
