1School of Environmental Science, The University of Shiga Prefecture, Hikone, Japan
2Institute for Future Initiatives, The University of Tokyo, Tokyo, Japan
3Institute of Energy Economics, Tokyo, Japan
4School of Engineering, the University of Tokyo, Tokyo, Japan
5Department of Environmental Engineering, Kyoto University, Kyoto, Japan
6National Institute for Environmental Studies, Tsukuba, Japan
7International Institute for Applied Systems Analysis, Laxenburg, Austria
8Institute of Applied Energy, Minato, Japan
9Institute for Global Environmental Strategies, Kanagawa, Japan
