In recent decades there has been a considerable growth in the activities of international tribunals and the establishment of new tribunals. Furthermore, supervisory bodies established to control compliance with treaty obligations have adopted decisions in an increasing number of cases. National courts further add to the practice of adjudication of claims based on international law. While this increasing practice of courts and supervisory bodies strengthens the adjudicatory process in international law, it also poses challenges to the unity of international law. Most of these courts operate within their own special regime (functional, regional, or national) and will primarily interpret and apply international law within the framework of that particular regime. The role of domestic courts poses special challenges, as the powers of such courts to give effect to international law, as well as their actual practice in applying such law, largely will be determined by national law. At the same time, both international and national courts have recognised that they do not operate in isolation from the larger international legal system, and have found various ways to counteract the process of fragmentation that may result from their jurisdictional limitations. This book explores how international and national courts can, and do, mitigate fragmentation of international law. It contains case studies from international regimes (including the WTO, the IMF, investment arbitration and the ECtHR) and from various national jurisdictions (including Japan, Norway, Switzerland and the UK), providing a basis for conclusions to be drawn in the final chapter.

Environmental taxes, relatively new legal instruments in the late-1990s, are likely to constitute an essential part of countries' efforts to avoid environmental degradation. This work analyzes inconsistencies in various categories of environmental taxes and the non-discrimination provisions of the General Agreement on Tariffs and Trade 1994 and how such conflicts can be resolved within the existing rules. As non-discrimination obligations are fundamental rules in the multilateral trading system, such potential conflicts carry great importance, both for the regime for the liberalization of international trade and for environmental protection measures. The author provides a detailed analysis of the role and nature of environmental taxes. The book assesses the extent to which the relevant provisions of GATT 1994 may impede the use of these taxes, in light of the non-discrimination provisions, the general exceptions, and the rules concerning nullification or impairment of benefits. The work also examines the possibilities of eliminating potential conflicts between environmental measures in general and the provisions of GATT 1994. The book offers an understanding of the complexities of and working with this aspect of international environmental law.

International investment arbitration remains one of the most controversial areas of globalisation and international law. This book provides a fresh contribution to the debate by adopting a thoroughly empirical approach. Based on new datasets and a range of quantitative, qualitative and computational methods, the contributors interrogate claims and counter-claims about the regime's legitimacy. The result is a nuanced picture about many of the critiques lodged against the regime, whether they be bias in arbitral decision-making, close relationships between law firms and arbitrators, absence of arbitral diversity, and excessive compensation. The book comes at a time when several national and international initiatives are under way to reform international investment arbitration. The authors discuss and analyse how the regime can be reformed and ow a process of legitimation might occur.

In recent decades there has been a considerable growth in the activities of international tribunals and the establishment of new tribunals. Furthermore, supervisory bodies established to control compliance with treaty obligations have adopted decisions in an increasing number of cases. National courts further add to the practice of adjudication of claims based on international law. While this increasing practice of courts and supervisory bodies strengthens the adjudicatory process in international law, it also poses challenges to the unity of international law. Most of these courts operate within their own special regime (functional, regional, or national) and will primarily interpret and apply international law within the framework of that particular regime. The role of domestic courts poses special challenges, as the powers of such courts to give effect to international law, as well as their actual practice in applying such law, largely will be determined by national law. At the same time, both international and national courts have recognised that they do not operate in isolation from the larger international legal system, and have found various ways to counteract the process of fragmentation that may result from their jurisdictional limitations. This book explores how international and national courts can, and do, mitigate fragmentation of international law. It contains case studies from international regimes (including the WTO, the IMF, investment arbitration and the ECtHR) and from various national jurisdictions (including Japan, Norway, Switzerland and the UK), providing a basis for conclusions to be drawn in the final chapter.