This book covers the significance of hydrogen in relation to energy transition, climate action, and sustainable development. And the unique aspect of this book is its comprehensive examination of the entire value chain of environmentally friendly hydrogen energy. It covers topics such as the following: the role of hydrogen in the energy transition and the goal of net zero emissions by 2050; the infrastructures involved in producing, storing, distributing, and using hydrogen; the process of converting hydrogen into chemicals and fuels; hydrogen safety, certification, and standards; and policies and strategies with regard to capacity building, energy security, and energy connectivity. Because hydrogen can address both energy and environmental issues, this value chain has recently come under scrutiny. Additionally, the book covers the significance of hydrogen in relation to energy transition, climate action, and sustainable development. As the world's economy moves away from carbon pollution, hydrogen will play a crucial role. Integrating hydrogen into several industrial sectors, including power, transportation, industry, and residential and commercial buildings, requires enhanced safety, efficiency, and cost-effectiveness at every stage of the value chain.