A worker checks the condition of strawberries at a greenhouse in Yuandang Village of Xiaoqiu Town in Tongchuan City, northwest China's Shaanxi Province, June 6, 2018. Tongchuan, once a manufacturing base for coal mining industry and cement production, used to suffer from environment pollutions. The local government has focused on sustainable development in the recent years and helped industries transform to grasp more opportunities. (Xinhua/Li Yibo)