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³ Greenhouse Gas Protocol.

⁴ “DOE Industrial Decarbonization Roadmap,” Department of Energy Office of Energy Efficiency & Renewable Energy.

⁵ “Saint-Gobain achieves the first zero-carbon production of flat glass in the world,” Saint-Gobain Glass, 16 May 2022.

⁷ Hand, E., “Hidden hydrogen,” Science, 16 Feb. 2023.

⁸ Meuleman, R. (2017). “The efficient future for the glass industry is ‘all-electric’,” In Proceedings from the 14th International Seminar on Furnace Design.