RT Journal Article T1 Green Hydrogen: Resources Consumption, Technological Maturity, and Regulatory Framework A1 Rey Luengo, Jesús A1 Segura Manzano, Francisca A1 Andújar Márquez, José Manuel AB Current climate crisis makes the need for reducing carbon emissions more than evident.For this reason, renewable energy sources are expected to play a fundamental role. However, thesesources are not controllable, but depend on the weather conditions. Therefore, green hydrogen(hydrogen produced from water electrolysis using renewable energies) is emerging as the key energycarrier to solve this problem. Although different properties of hydrogen have been widely studied,some key aspects such as the water and energy footprint, as well as the technological developmentand the regulatory framework of green hydrogen in different parts of the world have not beenanalysed in depth. This work performs a data-driven analysis of these three pillars: water and energyfootprint, technological maturity, and regulatory framework of green hydrogen technology. Resultswill allow the evaluation of green hydrogen deployment, both the current situation and expectations.Regarding the water footprint, this is lower than that of other fossil fuels and competitive with othertypes of hydrogen, while the energy footprint is higher than that of other fuels. Additionally, resultsshow that technological and regulatory framework for hydrogen is not fully developed and there is agreat inequality in green hydrogen legislation in different regions of the world. PB MDPI SN 1996-1073 (electrónico) YR 2023 FD 2023-08 LK https://hdl.handle.net/10272/22447 UL https://hdl.handle.net/10272/22447 LA eng NO Rey, J., Segura, F., & Andújar, J. M. (2023). Green Hydrogen: Resources Consumption, Technological Maturity, and Regulatory Framework. In Energies (Vol. 16, Issue 17, p. 6222). MDPI AG. https://doi.org/10.3390/en16176222 NO This research was funded by the Spanish Government, grant (1) Ref: PID2020-116616RBC31, and grant (2) Ref: RED2022-134588-T REDGENERA. DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026