Photo taken on May 17, 2015 shows an overlook of the Dianchi Lake surrounded with constructed wetlands and ecological forests in Kunming, capital of southwest China's Yunnan Province. Yunnan has been working hard against water pollution in the Dianchi Lake since 2011. A report released by China's Ministry of Environmental Protection last year revealed that pollution in the Dianchi Lake was rated as "severe". (Photo: Xinhua/Lin Yiguang)
