1. Department of Industrial & Systems Engineering and Management, National University of Singapore, 117575, Singapore
2. Energy Studies Institute, National University of Singapore, 119620, Singapore
3. Institute of Environmental Sciences, CML, Leiden University, Einsteinweg 2, 2333 CC Leiden, The Netherlands
4. College of Business Management and Economics, Chongqing University, Shazheng Street 174, Chongqing 400044, China