1. School of Economics, Nanjing University of Finance and Economics, Nanjing 210023, China
2. Green Economy Development Institute, Nanjing University of Finance & Economics, Nanjing 210023, China
3. School of Public Policy & Management, China University of Mining and Technology, Xuzhou 221116, China
4. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China