Wei Shanmin who guards a tung tree planted by Jiao Yulu for over 40 years speaks during a symposium in Lankao County, central China's Henan Province, March 22, 2019. A symposium on the creation of the film "My Father Jiao Yulu" was held in Lankao County. Jiao Yulu worked in Lankao County, a poor county in central China's Henan Province, in the 1960s and died of illness on duty. He devoted his life to combating sandstorms, soil contamination and floods while improving the lives of locals. (Xinhua/Xue Dongmei)