[Tu, Chengyi] Zhejiang Sci Tech Univ, Sch Econ & Management, Hangzhou, Peoples R China.
[Tu, Chengyi; D'Odorico, Paolo] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA.
[Li, Zhe] Univ South China, Sch Comp Sci, Hengyang, Peoples R China.
[Li, Zhe] Yunnan Univ, Sch Software, Kunming, Yunnan, Peoples R China.
[Suweis, Samir] Univ Padua, Ist Nazl Fis Nucl, Dept Phys & Astron G Galilei, Padua, Italy.