One of the tools that can facilitat

One of the tools that can facilitate industrial decision making towards sustainable resource management is Life Cycle Assessment (LCA). LCA is a standardized methodology that allows the compilation and evaluation of inputs, outputs and potential environmental impacts of a product system throughout its life cycle [3]. LCA application on H2 production has increased rapidly to guide challenging decisions and select between technology paths [4]. Spath and Mann [5] assessed the environmental performance of hydrogen production via natural gas steam reforming, including air and waste emissions, energy requirements and resource consumption. Utgikar and Thiesen [6] used global warming potential and acidification impact categories to characterize high-temperatureelectrolysis for hydrogen production via nuclear energy. Koroneos et al. [7] studied the environmental feasibility of hydrogen produced by biomass gasification. Cetinkaya et al. [8] used LCA for five methods of hydrogen production using energy equivalent and global warming potential (GWP) as criteria for evaluation. Acar and Dincer [9] comparatively assessed them for environmental impacts (global warming and acidification potential), cost, and energy efficiency. Up to date, the LCA of most studies on H2 production technologies discusses mainly the GWP impact category and the Centre for Environmental Studies (CML) version is found to be the most applied life cycle impact assessment methodology [10,11]. A review of all LCA studies of hydrogen energy systems is providedby Valente et al. [11] indicating the need for a harmonized framework to provide consistent and comparable life cycle impacts that help identify the most favorable systems. Thus, a comprehensive evaluation of the different systems for hydrogen production should be carried out in order to check their suitability according to sustainability criteria.