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: J. Light Metal Welding 60(3) (2022) 17–22.
3. 3) SDGs Journal (2022), http://sdgs-support.or.jp/journal/decarbonization/ (in Japanese).
4. 4) Energy White Paper 2021, https://www.encho.meti.go.jp/about/white paper/2021/pdf/1_2.pdf (in Japanese).
5. 5) Green Growth Strategy Thorough Achieving Carbon Neutrality in 2050, https://www.meti.go.jp/english/policy/energy-enviroment/global-warming/ggs 2050/index.html.