1. 1) IPCC special report Global Warming of 1.5°C, https://www.ipcc.ch/sr15/.
2. 2) Report: Annual lecture meeting 2021 panel discussion, Journal of Light Metal Welding, Vol.60, No.3, March, 2022, pp.17-22.
3. 3) SDGs ジャーナル（2022）， http://sdgs-support.or.jp/journal/decarbonization/
4. 4) エネルギー白書 2021， https://www.encho.meti.go.jp/about/whitepaper/2021/pdf/1_2.pdf.
5. 5) Green Growth Strategy Thorough Achieving Carbon Neutrality in 2050, https://www.meti.go.jp/english/policy/energy-enviroment/global-warming/ggs2050/index.html