Huo Daishan, 61, is born in Shenqiu County of Henan Province, the largest cluster of "cancer villages" near China's Huaihe River since the 1980s. He is a passionate advocate for the Huaihe River, China's third largest and most polluted river due to millions of tons of waste and sewage dumped by those industries located along its banks. [Photo/Huaihe River Guardians]