This Companion presents a distinctive approach to environmental planning by: situating the debate in its social, cultural, political and institutional context; being attentive to depth and breadth of discussions; providing up-to-date accounts of the contemporary practices in environmental planning and their changes over time; adopting multiple theoretical and analytical lenses and different disciplinary approaches; and drawing on knowledge and expertise of a wide range of leading international scholars from across the social science disciplines and beyond. It aims to provide critical reviews of the state-of-the-art theoretical and practical approaches as well as empirical knowledge and understandings of environmental planning; encourage dialogue across disciplines and national policy contexts about a wide range of environmental planning themes; and, engage with and reflect on politics, policies, practices and decision-making tools in environmental planning. The Companion provides a deeper understanding of the interdependencies between the themes in the four parts of the book (Understanding ‘the environment’, Environmental governance, Critical environmental pressures and responses, and Methods and approaches to environmental planning) and its 37 chapters. It presents critical perspectives on the role of meanings, values, governance, approaches and participations in environmental planning. Situating environmental planning debates in the wider ecological, political, ethical, institutional, social and cultural debates, it aims to shine light on some of the critical journeys that we have traversed and those that we are yet to navigate and their implications for environmental planning research and practice. The Companion provides a reference point mapping out the terrain of environmental planning in an international and multidisciplinary context. The depth and breadth of discussions by leading international scholars make it relevant to and useful for those who are curious about, wish to learn more, want to make sense of, and care for the environment within the field of environmental planning and beyond.