Transnational Environmental Law provides a platform for scholarly debate on environmental law and governance beyond the state, with a focus on the contributions of non-state actors to the development of law and regulation. The contributions in this issue build on these themes by expanding the scope of transnational environmental law in two ways. The first four articles shift the focus towards entities that are, or arguably should be, even more central to the development of transnational environmental law and governance than non-state actors, yet they face formidable barriers to recognition: the entities that constitute the 'environment' itself. The second set of articles considers more traditional actors of environmental regulationthe United Kingdom (UK), the United States (US), and Chinabut explores new ways in which they may be able to interact and learn from each other in the area of environmental law and governance. While very different in focus and approach, both sets of contributions highlight the unique challenges and opportunities of transnational environmental law and scholarship. Most modern legal systems have developed out of a need to structure the relationships between governments and their people, and between people inter se. The ideal of a society governed by the rule of law tends to be juxtaposed to Hobbes' 'state of nature', where the lack of a social contract between individuals results in the absence of rights and duties and the dominance of 'freedoms'. 1 However, neither the societal models shaped by legal rules nor, ironically, the state of nature have meaningfully incorporated the relationship between humans and their environment. Instead, environmental law focuses on the impact of human behaviour upon the environment. Most jurisdictions preclude the possibility of the environment speaking on its own behalf or making claims based on its own interests. 2 However, as demonstrated by the first four articles in this volume, important changes may be afoot regarding the legal agency of 'the environment', implicating a shift that might move the humanenvironment relationship closer to other legal relationships. The first two articlesby Louis Kotzé and Paola Villavicencio Calzadilla, and Roderic O'Gormandiscuss the rise of environmental constitutionalism and the relation between a constitutional 1