Aerial photo taken on May 11, 2019 shows Yanhewan Bridge in Yan'an City, northwest China's Shaanxi Province. Since China launched a program to return cultivated land to forests, Yan'an has returned 10.77 million mu (about 718 thousand hectares) cultivated land to forests, with vegetation coverage rate rising from 46 percent in 2000 to over 80 percent at present. (Xinhua/Tao Ming)