Participants pose for a photo in a cleaning campaign on the north slope of Mount Qomolangma in Southwest China's Tibet Autonomous Region, May 10, 2017. Organized by the Chinese Mountaineering Association and the Sports Bureau of Tibet, the event attracted more than 100 people including local residents and climbers from over 20 countries to clear up oxygen cylinders, cans, bottles, plastic, discarded tents and climbing ropes that littered the mountain. (Photo: China News Service/Chen Taobin)
