This picture taken on June 29, 2016 shows workers cleaning algae on a beach in Qingdao, east China's Shandong province. The algal phenomenon, an annual occurrence in Qingdao, is usually caused by an abundance of nutrients in the water, especially phosphorus, although the triggers for the enormous blooms which began to appear in the Yellow Sea in 2007 remain uncertain. (Photo by AFP Photo/Stringer)
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