【轻松英文阅读】登山者引起的环境污染（在线收听）

 It has been more than 60 years since Edmund Hillary and Tenzing Norgay climbed to the summit of Everest. The summit was a lonely and pristine place in those days. These days, however, the summit is a busy place. Almost 4, 000 people have climbed to the summit in the past 60 years, and most of them in the past decade. Along with all the people has come the problems that people bring, like garbage. It has been estimated that there are over 50 tons of garbage on Everest. Plastic bottles, clothes, ropes, damaged tents and oxygen canisters are only a few examples. Sadly, the highest mountain in the world has become the highest garbage dump in the world.