Achieving carbon neutrality is crucial for creating a sustainable and resilient future worldwide. The circular economy framework focuses on reducing waste, optimizing resource use, and promoting regenerative practices, thus curbing carbon footprints. Concurrently, sustainable energy techniques, such as harnessing renewable sources, enhancing energy storage, and boosting energy efficiency, contribute to the reduction of greenhouse gas emissions. With a unique emphasis on net-zero emission approaches, this book delves into circular economy principles and sustainable energy materials, offering a comprehensive perspective on climate change challenges.Covers fundamental circular economy principles, from carbon capture to advancements in biomass and hydrogen energyExplores recycling techniques for essential energy materials, including batteries, solar cells, and fuel cellsProvides detailed coverage of technologies, processes, and challenges related to achieving sustainability in the energy sectorBridges theory and practical applicationsOffering a roadmap toward a carbon neutral and net-zero emission future, this book serves as a valuable resource for advanced students, researchers, engineers, and policymakers worldwide seeking solutions to climate change and sustainable development.