This comprehensive Research Handbook is the first study to link law and Earth system science through the epistemic lens of the planetary boundaries framework. It critically examines the legal and governance aspects of the framework, considering not only each planetary boundary, but also a range of systemic issues, including the ability of law to keep us within the planetary boundaries' safe operating space.The expert contributors investigate the current and potential role of law in relation to the complex task and regulatory challenges of governing the Earth system. They explore three thematic areas: the overarching legal, ethical and governance dimensions of the planetary boundaries; their diverse international law dimensions and the challenges they raise for international law; and the extent to which the law already provides for some of the aspects illuminated by each planetary boundary, alongside opportunities for legal reform.Lawyers, Earth system scientists and governance experts will benefit from the mapping of the next stage of international environmental law included in the chapters. The book will also be a key resource for regulators, legislators and policy-makers looking for an in-depth study of the relationship between law and each of the nine planetary boundaries.