1. a Faculty of Economics , Kyushu University , Fukuoka , Japan
2. b Bren School of Environmental Science and Management , The University of California , Santa Barbara , USA
3. c Faculty of Political Science and Economics , Waseda University , Tokyo , Japan
4. d Industrial Ecology Programme , Norwegian University of Science and Technology , Trondheim , Norway
5. e Center for Material Cycles and Waste Management Research , National Institute for Environmental Studies , Tsukuba , Japan
6. f Integrated Sustainability Analysis, School of Physics, Faculty of Science , The University of Sydney , NSW , Australia