Fanglei Zhong¹, Daiwei Jiang¹, Aijun Guo¹, Asmat Ullah², Xiao Yang³, Qingping Cheng⁴, Yongnian Zhang¹ and Xiaojiang Ding¹, (1)Lanzhou University, School of Economics, Lanzhou, China, (2)King Mongkut’s University of Technology Thonburi, The Joint Graduate School of Energy and Environment, Bangkok, Thailand, (3)Lanzhou Municipal Sub-branch, the People's Bank of China, Lanzhou, China, (4)Northwest Institute of Eco-Environmental and Resources, Chinese Academy of Sciences, Lanzhou, China, Lanzhou, China