The European Journal of International Law Vol. 31 no. 1 © The Author(s), 2020. Published by Oxford University Press on behalf of EJIL Ltd. All rights reserved. For Permissions, please email:
[email protected] Guiding Principles on Shared Responsibility in International Law André Nollkaemper,1, Jean d’Aspremont,2, Christiane Ahlborn,3 Berenice Boutin,4 Nataša Nedeski5 and Ilias Plakokefalos,6 with the collaboration of Dov Jacobs7 Abstract It is common in international practice that several states and/or international organizations contribute together to the indivisible injury of a third party. Examples thereof are aplenty in relation to climate change and other environmental disasters, joint military activities and cooperative actions aimed at stemming migration. Such situations are hardly captured by the existing rules of the law of international responsibility. In particular, the work of the International Law Commission, which is widely considered to provide authoritative guidance for legal questions of international responsibility, has little to offer. As a result, it is often very difficult, according to the existing rules of the law of international responsibility, to share re- sponsibility and apportion reparation between the states and/or international organizations that contribute together to the indivisible injury of a third party. The Guiding Principles on Shared Responsibility in International Law seek to provide guidance to judges, practitioners and researchers when confronted with legal questions of shared responsibility of states and international organizations for their contribution to an indivisible injury of third parties. The Guiding Principles identify the conditions of shared responsibility (including questions 1 Amsterdam Center for International Law, University of Amsterdam, The Netherlands.