1. Department of Management Science and Engineering, School of Economics and Management; China University of Geosciences; Wuhan 430074 PR China
2. Department of Environmental Sciences, Faculty of Science and Engineering; Macquarie University; Sydney 2109 NSW Australia
3. Research Centre of Resource and Environmental Economics; and Mineral Resource Strategy and Policy Research Centre of China; China University of Geosciences; Wuhan 430074 PR China
4. Department of Applied Economics, School of Economics and Management; China University of Geosciences; Wuhan 430074 PR China
5. Senior Network Security Researcher; Wuhan Greenet Information Service Co., Ltd; Wuhan 430074 PR China
6. Business School; Jianghan University; Wuhan 430056 PR China
7. School of Natural and Environmental Sciences; Newcastle University; Newcastle Upon Tyne NE1 7RU UK