[1] UCL, Bartlett Sch Sustainable Construct, London WC1E 7HB, England
[2] Xi An Jiao Tong Univ, Sch Management, Xian 710049, Peoples R China
[3] Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China
[4] UCL, Dept Polit Sci, London WC1H 9QU, England
[5] Tsinghua Univ, Dept Earth Syst Sci, Beijing 100080, Peoples R China
[6] Univ Maryland, Dept Geol Sci, College Pk, MD 20742 USA