*Masahiro Sugiyama¹, Yosuke Arino², Shinichiro Asayama³, Atsushi Ishii⁴, Takanobu Kosugi⁵, Atsushi Kurosawa⁶, Shingo Watanabe⁷ (1.Policy Alternatives Research Institute, the University of Tokyo, 2.Research Institute of Innovative Technology for the Earth, 3.National Institute for Environmental Studies, 4.Center for Northeast Asian Studies, Tohoku University, 5.College of Policy Science, Ritsumeikan University, 6.Institute of Applied Energy, 7.Japan Agency for Marine-Earth Science and Technology)