Kofi Annan concluded the Aarhus Convention was 'the most ambitious venture in environmental democracy undertaken under the auspices of the United Nations'. 21 years since its adoption, this edited collection reflects on the Convention's impact across a number of key themes. It explores the Convention's role in the legal and political order; its jurisdictional impact; the role of the Compliance Committee; Aarhus and the European Union; Aarhus and Brexit. It also looks at the Convention's national impact, charting its application in practice in England and Wales, Scotland, Northern Ireland and Ireland. It addresses procedural issues such as standing, costs and remedies. Addressing questions of origins and scope to policy and practice, all environmental lawyers will find this collection invaluable.