A trash-cleaning boat moves along the trees where egrets rest in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)
A trash-cleaning boat moves along the trees where egrets rest in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)