A bird flies over a wetland near the Dianchi Lake in Southwest China's Yunnan province, July 12, 2016. In a bid to improve water quality and preserve environment of the lake, the local governments have taken a series of pollution control measures including the development and restoration of the wetland. To date, more than 20 wetland parks surrounding the lake have been established, playing a positive role in improving the ecology. [Photo/Xinhua]
Visitors play at a wetland park near the Dianchi Lake in Southwest China's Yunnan province, July 12, 2016. [Photo/Xinhua]
Workers clean up rubbish on Dianchi Lake in Southwest China's Yunnan province, March 15, 2016. The province plans to invest 3.3 billion yuan ($493.63 million) this year in 88 pollution control projects in Dianchi, of which 26 will be completed this year and the rest will be wrapped up by the end of next year. [Photo/Xinhua]
Birds fly over the Dianchi Lake in Southwest China's Yunnan province on Jan 7, 2016. [Photo/Xinhua]