Environmental Claims by States in Investment Treaty Arbitration

Abstract

Recent years have witnessed a number of counterclaims by State parties in investment treaty arbitrations based on environmental concerns and the need to protect local resources and safeguard the associated human rights of local communities. This article charts the development of the case law in this context, starting with the Urbaser v. Argentina award of December 2016, before examining its impact on the cases that followed in its wake, notably including the respective 2017 and 2018 awards in Burlington v. Ecuador and Aven v. Costa Rica. It concludes by considering whether these recent cases mark the beginning of a new era of international law claims which finds a parallel in the broader paradigm shift in public discourse on the critical role of all stakeholders in the conservation of the environment, and which may one day result in investors facing standalone claims as the respondent in future investment treaty claims brought by States.