*Masahiro Sugiyama¹, Shinichiro Asayama², Takanobu Kosugi³, Atsushi Ishii⁴, Seita Emori⁵ (1.Policy Alternatives Research Institute, the University of Tokyo, 2.Center for Social and Environmental Systems Research, National Institute for Environmental Studies, 3.College of Policy Science, Ritsumeikan University, 4.Center for Northeast Asian Studies, Tohoku University, 5.Center for Global Environmental Research, National Institute for Environmental Studies)