Energy Transition and the green economy are considered key issues at the political and legal level all around the world, not only today but for the foreseeable future. The transformations needed to achieve this have just begun, and the technological and behavioral changes this requires is likely to impact most aspects of our day to day lives. Environmental Tax Studies for the Ecological Transition provides a wide selection of papers presented at the 19th Global Conference on Environmental Taxation under the topic "Environmental Tax Challenges in the 21st Century: Urban Concentration and Increasing Transport". In particular, in this very timely volume, the articles discuss different aspects of environmental taxes and other economic instruments in the context of the "ecological transition", a topic of great interest for the scientific community and society as a whole. The book, divided into five parts, contains a range of original studies written by scholars and professionals working worldwide in the field of environmental taxation. Economic Instruments and Energy Transition, Smart Cities and Urban Perspectives, Air Pollution and the Transport Sector, Energy Taxation and Governance and Challenging Issues are some of the topics addressed in the study. In short, this book is meant to be a practical and helpful guide for researchers and practitioners interested in the theoretical and practical aspects of environmental issues from a fiscal point of view.