Blue Sky rescue team clean garbage on cliff in Zhangjiajie(1/4)

Photo shows members of Zhangjiajie Blue Sky rescue team picking garbage at Huangshizhai scenic spot in Zhangjiajie, central China's Hunan Province, Oct. 21, 2020. The Blue Sky rescue team, formed by local volunteers, call on tourists here to protect the environment. (Photo/China News Service)

Aerial photo taken on shows members of Zhangjiajie Blue Sky rescue team picking garbage at Huangshizhai scenic spot in Zhangjiajie, central China's Hunan Province, Oct. 21, 2020. The Blue Sky rescue team, formed by local volunteers, call on tourists here to protect the environment. (Photo/China News Service)

Photo shows members of Zhangjiajie Blue Sky rescue team picking garbage at Huangshizhai scenic spot in Zhangjiajie, central China's Hunan Province, Oct. 21, 2020. The Blue Sky rescue team, formed by local volunteers, call on tourists here to protect the environment. (Photo/China News Service)

Photo shows a member of Zhangjiajie Blue Sky rescue team picking garbage at Huangshizhai scenic spot in Zhangjiajie, central China's Hunan Province, Oct. 21, 2020. The Blue Sky rescue team, formed by local volunteers, call on tourists here to protect the environment. (Photo/China News Service)