Customary international law remains a central source of international law and the core of the international legal system. It continues to draw the attention of lawyers, especially at a time marked by the great expansion of international law and its increasing application in domestic and international courts. Determining whether an applicable rule of customary international law exists is therefore of great practical concern - but this important legal task is not always simple or straightforward. This book serves as guidance to those seeking to determine the existence of rules of customary international law and their content. It elaborates on the methodology for the identification of rules of customary international law and examines a host of questions concerning the process and evidence at issue. It does so by complementing the authoritative work of the UN International Law Commission on this topic, and by drawing upon a wealth of additional practice and writings. Identification of Customary International Law provides an overview of the Commission's work and expands on it by addressing the nature and history of custom as a source of international law, inquiring into each of the two constituent elements of customary international law (namely, a general practice and opinio juris), explaining the value and limits of certain forms of evidence, and throwing further light on such issues as the persistent objector rule and particular customary international law. Practitioners and scholars alike will find this detailed treatment useful in seeking to determine the existence and content of any customary rule and in ensuring that arguments about customary international law are persuasive.

Patrick Dumberry provides a comprehensive analysis of the rules of customary international law in the field of international investment law.

The book offers a systematic discussion of the facets of the relationship between the European Union and customary international law.

Customary international law remains a central source of international law and the core of the international legal system. It continues to draw the attention of lawyers, especially at a time marked by the great expansion of international law and its increasing application in domestic and international courts. Determining whether an applicable rule of customary international law exists is therefore of great practical concern - but this important legal task is not always simple or straightforward. This book serves as guidance to those seeking to determine the existence of rules of customary international law and their content. It elaborates on the methodology for the identification of rules of customary international law and examines a host of questions concerning the process and evidence at issue. It does so by complementing the authoritative work of the UN International Law Commission on this topic, and by drawing upon a wealth of additional practice and writings. Identification of Customary International Law provides an overview of the Commission's work and expands on it by addressing the nature and history of custom as a source of international law, inquiring into each of the two constituent elements of customary international law (namely, a general practice and opinio juris), explaining the value and limits of certain forms of evidence, and throwing further light on such issues as the persistent objector rule and particular customary international law. Practitioners and scholars alike will find this detailed treatment useful in seeking to determine the existence and content of any customary rule and in ensuring that arguments about customary international law are persuasive.

Provides an in-depth study of the theory, history, practice, and interpretation of customary international law.

A comprehensive doctrinal study of states' obligations on climate change mitigation, showing that obligations arise not only from climate treaties, but also from customary international law, unilateral declarations, and human rights treaties, and exploring the interactions between these multiple obligations.

Reexamining Customary International Law takes on the complex issues and controversies surrounding the history, theory, and practice of customary international law as it reexamines customary law's increasingly important role in world affairs. It incorporates the expertise of distinguished authors to probe many difficult issues that remain unresolved concerning the doctrine of customary law. At the same time, this book engages in a profound exploration of the practical role of customary international law in a variety of important fields, including humanitarian law, human rights law, and air and space law.

The instinctual desire to support those in need, irrespective of geographic, cultural or religious links, is both facilitated and overwhelmed by the extent of information now available about the multiple humanitarian crises which occur on a daily basis around the world. Behind the images of devastating floods and earthquakes, or massive forced displacements resulting from armed conflicts, is the all too real suffering faced by individuals and families. From the 2004 Indian Ocean Tsunami to the on-going conflict in Syria, recent years have seen an increasing debate regarding the international legal mechanisms to protect persons in such humanitarian crises. The International Legal Protection of Persons in Humanitarian Crises argues that an acquis humanitaire is identifiable through the interconnected web of existing and emerging international, regional and national laws, policies and practices for the protection of persons caught up in humanitarian crises. Indeed, the humanitarian imperative to alleviate suffering wherever it may be found permeates various branches of international law, and is reflected in the extensive humanitarian activities undertaken by States and other actors in times of armed conflict, population displacement and disaster. Dug Cubie argues that by clarifying the conceptual framework and normative content of the acquis humanitaire, gaps and lacunae can be identified and the overall protection of persons strengthened.

In The Rome Statute as Evidence of Customary International Law, Yudan Tan offers a detailed analysis of topical issues concerning the Rome Statute of the International Criminal Court as evidence of customary international law.

This book explores consequences arising in the field of State responsibility in relation to those arising for the individual in international criminal law, a relationship that broadly defines duality of responsibility in international law.