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Hydrogen, energy vector for the future? Or on the contrary, limited for many more decades, possibly even until the end of the century, to its current applications in the field of chemistry and refining? Advocates of the hydrogen civilisation and the sceptics, even the declared opponents, are deeply divided over this issue. For the first, following a technological revolution, hydrogen would play a universal role along-side electricity as a substitute for fossil fuels, especially (but not only) in transport, leading to radical elimination of CO2 emissions. For the second, hydrogen will remain restricted to its current applications due to the insoluble problems inherent to its generalised use, especially in transport. This book highlights the increasing and inevitable role of «energy» hydrogen – as compared with chemical hydrogen – in the key sectors of transport and «clean» electricity production. The first section is dedicated to current uses of energy hydrogen, or those accessible in the not too distant future. The second section provides an update on the technologies that are either commercially available or at an advanced stage of development for the production, distribution and storage of hydrogen. The last section examines the central problem of safety if hydrogen is to be used by the general public, before concluding on the short and medium term development perspectives of energy hydrogen.This highly documented book is intended for a broad readership: transport companies (road, air and waterway), engine engineers and, more generally, everyone interested in the future of transport and fuels in the post-oil world