1. Ma Yinchu School of Economics, Tianjin University, Tianjin, People’s Republic of China
2. China Academy of Energy, Environmental and Industrial Economics, Tianjin University, Tianjin, People’s Republic of China
3. College of Management and Economics, Tianjin University, Tianjin, People’s Republic of China
4. College of the Environment & Ecology, Xiamen University, Xiamen, People’s Republic of China