Recent Publications

Journal Articles

FY2024

Sugiyama, M., Fujimori, S., Wada, K., Kato, E., Matsuo, Y., Nishiura, O., Oshiro, K., Otsuki, T.,“Residual emissions and carbon removal towards Japan’s net-zero goal: a multi-model analysis“,2024.doi:10.1088/2515-7620/ad4af2

(This paper employs a multi-model analysis to demonstrate that achieving Japan’s 2050 net-zero goal requires both large-scale emissions reductions—driven by energy efficiency and clean technologies—and the strategic implementation of Carbon Dioxide Removal (CDR).)

Kawaguchi, S., Fujimori, S., Oshiro, K., Maruta, Y., Yoshida, Daiki, Chao, S., Hasegawa, T., “Assessment of the Impacts of Japan’s 2050 Decarbonization Scenarios on Different Income Groups.” Environmental & Sanitary Engineering Research, 2024

Kawaguchi, S., Fujimori, S., Oshiro, K., Maruta, Y., Yoshida, Daiki, Chao, S., Hasegawa, T., “Impact Assessment of Japan’s Decarbonization Scenarios on Household Consumption Considering Income Groups.” Journal of Japan Society of Civil Engineers, 2024 doi:10.2208/jscejj.24-27002

(This paper utilizes a multi-model approach to evaluate the impacts of Japan’s decarbonization scenarios on household consumption across different income groups. It highlights the potential for regressivity and discusses the critical importance of policy interventions to mitigate these effects.)

FY2023

Oshiro, K., Fujimori, S.,“Mid-century net-zero emissions pathways for Japan: Potential roles of global mitigation scenarios in informing national decarbonization strategies.”,Energy and Climate Change, vol. 5, p.100128,　2024.doi:10.1016/j.egycc.2024.100128

(This paper demonstrates the necessity of electrification and large-scale Carbon Dioxide Removal (CDR) to achieve Japan’s 2050 net-zero goal. It further examines the costs and dependency risks associated with hydrogen and carbon credit imports, ultimately highlighting the critical importance of a global evaluation perspective.)

Edmonds, J., Fujimori, S., Iyer, G., McJeon, H., O’Rourke, P., Tristan, J., Vuuren, D.v., Yu, S.,“Global Energy System Transitions”,Review of Environmental Economics and Policy, vol. 18, no. 1, p2-25, 2024. doi:10.1086/728206

(This paper compares current trends in the global energy system with alternative scenarios compatible with climate change mitigation. It also identifies key research challenges to better support informed decision-making.)

Presentations

FY2024

Otomo, J. “Carbon Neutral Technologies Empowered by Solid State Ionics: Fuel Cells, Energy Carriers, and Carbon Recycling.” The Society of Chemical Engineers, Japan (SCEJ) Utsunomiya Meeting 2024, Tochigi, Japan. November 8, 2024.

Fujimori, S. “Climate Change and a Decarbonized Society: The Society We Aim For — Uncovering Key Factors for a Sustainable Society and Vibrant Economic Activity.” Policy Design Series Vol. 8, Design Forum, Kyoto, Japan. March 18, 2025.

Otomo, J. “Techno-Economic Analysis of Hydrogen, Fuel Cells, and Energy Storage Technologies: Initiatives in Prospective and Proactive Techno-Economic Analysis (Cost Engineering).” Platinum Renewable Energy Initiative, March 21, 2025.

FY2023

Otomo, J. “Cost Engineering of SOFC/SOEC Systems and PCFC Systems.” The 127th SOFC Society of Japan Meeting, Tokyo, Japan. April 25, 2023.

Otomo, J. “Hydrogen Production and Carbon Recycling Using the Chemical Looping Method.” Lecture Meeting of the Advanced Chemical & Material Technology Division, Japan Association for Chemical Innovation (JACI), June 20, 2023.

Otomo, J. “Cell and System Design of Protonic Ceramic Fuel Cells (PCFCs) for Higher Efficiency.” The 284th Regular Meeting of the Fuel Cell and FCH Association, Osaka, Japan. July 10, 2023.

Otomo, J. “Development of Next-Generation Highly Efficient Fuel Cells and Application to Electrosynthesis.” The 54th SCEJ Autumn Meeting, Fukuoka, Japan. September 12, 2023.

Fujimori, S. “Climate Change and a Decarbonized Society: The Role of Sewage Systems in Solving Climate Issues.” Lecture on the Role of Sewerage in Climate Change Mitigation, Japan Society of Civil Engineers (JSCE), Tokyo, Japan. January 23, 2024.

Otomo, J. “Solid State Ionics and Reaction Systems for Carbon Neutrality.” The 26th Hanko-kai Lecture Meeting, The Society of Chemical Engineers, Japan (SCEJ), Osaka, Japan. March 17, 2024.