In this aerial photo taken on March 21, 2018, workers plant trees on a forestation site in Xiongan New Area, north China's Hebei Province. Xiongan New Area, established on April 1, 2017, is a new economic zone about 100 kilometers southwest of Beijing. It is the third new area of national significance after the Shenzhen Special Economic Zone and the Shanghai Pudong New Area. China aims to build it as a low-carbon, intelligent, livable and globally influential city where people and nature exist in harmony. (Xinhua/Yang Shiyao)