Preface. Energy Security through Hydrogen; J.W. Sheffield.- 21st Century's Energy: Hydrogen Energy System; T.N. Veziroglu.- Energy Policy is Technology Politics - The Hydrogen Energy Case; C.J. Winter.- Hydrogen from Renewables; N. Lymberopoulos.- Hydrogen Fuelling Sustainability of Energy Systems, Regional Integration and Development: The Sahara Wind Project; K. Benhamou.- Pathway for Hydrogen in Urban Transit System; T.K. Bose et al.- Energy Transitions in Transportation: Is It a Technology or a Policy Driven Process?; R. Macario.- Prospects for Hydrogen as a Military Fuel K. D. Pointon, J.B. Lakeman.- The US Military and Hydrogen in Missouri; S.Tupper.- Fuel Cells for Clean Power Generation: Status and Perspectives; F. Barbir.-Performance of Single-Chamber Solid Oxide Fuel Cells; I. Kellogg et al.- Hydrogen Production from Solar Energy; I.E. Ture.- Chemical Synthesis of Mixed-Oxide Powders for Solid Oxide Fuel Cell (SOFC) Electrolyte and Electrodes; C. OEncel, M.A. Gulgun.- Solar Hydrogen Production in Algeria: Perspectives and Applications; S. Labed.- Bio-Hydrogen Production by Anaerobic Biological Fermentation of Agriculture Waste; M. Al-Alawi.- Hydrogen Energy System for Sustainable Development; N.H. Afgan, M.G. Carvalho.-Renewable Energy in Armenia: State of The Art and Development Strategies (Hydropower); S. Gevorgyan, V. Sargsyan.- Renewable Energy in Armenia: State of The Art and Development Strategies (Wind, Solar And Hydrogen Energy); S. Gevorgyan,and V. Sargsyan.- Thermodynamic Efficiency Analysis of a Hydrogen Production System Fuelled with Hydrocarbon Fuels for Fuel Cell Applications; A. Ersoez et al.-Development of Ecologically Friendly Technology for Gasification of Municipal Solid Wastes; M. Slenkin, G. Geletukha.- Prospects for Sustainable Development of Ukrainian Energy Sector; O. Udovyk.- The Latest Activities of International Ecoenergy Academy on Renewable Energy Development in Azerbaijan; F.G. Aliyev, F.F. Aliyev.- The Hydride Systemsand Peculiarities of Hydrogen Solubility in These Structures; S. Y. Zaginaichenko et al.- Author Index. Subject Index.