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Volunteers patrol along a river in Beibei District, Chongqing, southwest China, Feb. 23, 2019. A team of nearly 30 volunteers took action in a voluntary service launched in 2018 aimed at clearing and protecting the local river. [Photo by Qin Tingfu/Xinhua]

Volunteers collect rubbish on a river bank in Beibei District, Chongqing, southwest China, Feb. 23, 2019. A team of nearly 30 volunteers took action in a voluntary service launched in 2018 aimed at clearing and protecting the local river. [Photo by Qin Tingfu/Xinhua]

Volunteers patrol by a river in Beibei District, Chongqing, southwest China, Feb. 23, 2019. A team of nearly 30 volunteers took action in a voluntary service launched in 2018 aimed at clearing and protecting the local river. [Photo by Qin Tingfu/Xinhua]