Updated throughout, the fourth edition of this fascinating textbook is suitable for undergraduate and postgraduate courses covering green chemistry. It still focuses on the core principles of green chemistry but has a new emphasis on how green chemistry can help solve many of the environmental problems facing society. In particular there is a new chapter on energy decarbonisation and climate change, bringing together sustainable energy solutions, possibilities for a fossil free chemical industry and showing how green chemistry can help other sectors such as transport and energy generation achieve net zero.