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A Risky Trip Up Mount Everest Pollution on Mount Everest Mount Everest—Clean-up Effort Robert Hoffman and His Clean-up Team
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is opposed by the local people is the largest one supported by Nepal is encouraged by the American government is the greatest one ever made on Mount Everest
The success in climbing up the mountain. The environmental pollution of the mountain. The equipment for their trip to the mountain. The risks facing the climbers of the mountain.
在Appearance外观调板的弹出菜单中选择DeleteItems命令 单击调板上Trash按钮（垃圾桶） 直接将外观属性拖拉到Trash按钮（垃圾桶）上 在调板的弹出菜单中选择RemoveItems命令
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To make Everest even cleaner than it was. To tell climbers not to leave waste materials. To take away all the trash they could find there. To collect and treat human waste before the ice melted.
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its original condition half a century ago its former state a few years ago a place without pollution at all the cleanest mountain in the world
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