The future energy needs have to be met essentially by making use of solar radiation. As this area of research centers on the production of fuel hydrogen and production of chemicals from CO2 and N2 these important aspects are extensively covered. Although more than 40 years of research in these frontier areas has not resulted in viable technologies, this book provides clues for success in the future. In every respect this exercise is an unique one and the contents can be comprehended by general readers interested in the topic of energy.