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The global economic growth, the increase in the, and advances in technology lead to an increment in the primary energy demand. Considering that most of this is currently supplied by fossil fuels, a considerable amount greenhouse gases are emitted, contributing to climate change, is the reason why the next European Union binding is focused on reducing carbon emissions using. This study reviews different technologies for hydrogen using renewable and non-renewable resources. , a comparative analysis is performed on renewablebased technologies to evaluate which technologies are economically and energetically more promising. The results show how -based technologies allow for a similar hydrogen yield compared to those obtained with water-based technologies but with energy efficiencies and lower operational costs. More specifically, biomass gasification and steam reforming obtained a proper between the studied parameters, with gasification being the technique that allows for higher hydrogen yields, while steam is more energy-efficient. Nevertheless, the application of hydrogen as the energy vector of the future requires both the use renewable feedstocks with a sustainable energy source. This combination would potentially produce green hydrogen while carbon dioxide emissions, limiting global climate change, and, thus, achieving the so-called hydrogen economy
Megía et al. (Thu,) studied this question.