United Nations Commission on International Trade Law (UNCITRAL) WG-III
Beyond Amicus Curiae: Rethinking the Role of Third-Party Participation in Investment Arbitration and Environmental Governance
By Paulina Kuehme, Lakshmi Swathi Ganti, Brian Kelly Nyaga, Mattia Semenza
Supervisor: Prof. Elena Cima
Prepared for the South Centre as part of the Geneva Graduate Institute’s LL.M. Legal Clinic Programme, International Environmental Law and Governance Stream
This document examines third-party participation in Investor-State Dispute Settlement (ISDS), with a particular emphasis on environmental considerations. It investigates how to ensure procedural fairness and enable meaningful involvement of affected communities in cases concerning environmental protection. The study assesses the scope and challenges of such participation, including the ability to present evidence and legal arguments related to environmental impacts. It also explores the potential role of third-party involvement in shaping counterclaims against investors for environmental damage, and its possible influence in mitigating compensation by introducing arguments and evidence related to environmental costs. Through this analysis, the project aims to support a more balanced and sustainable ISDS framework – one that protects both investors and the environment – while fostering community empowerment and strengthening accountability for environmental harm.
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The Constitutional Shield: How Colombia’s Judiciary Shapes Investment Treaties Through Joint Interpretation
By Daniel Uribe Teran
This policy brief examines an innovative judicial approach by the Colombian Constitutional Court in response to an increase in investor-state dispute settlement (ISDS) claims. The Court introduced a doctrine called ‘conditional constitutionality’ (exequibilidad condicionada), which mandates the executive to negotiate binding joint interpretative declarations prior to ratifying an International Investment Agreement (IIA). This process aims to clarify ambiguous language and ensure that IIA provisions align with constitutional principles, particularly concerning the sovereign right to regulate and the protection of human and environmental rights.
The analysis examines the “constitutional shield” doctrine established by this domestic mechanism, emphasising its legal basis in Article 31.3(a) of the Vienna Convention on the Law of Treaties. However, it highlights a significant discrepancy: the uncertain acknowledgement of these subsequent agreements within the international investment arbitration framework. The brief notes that arbitral tribunals, which often function as autonomous legal systems, may not consistently respect such domestic constitutional provisions. This creates ongoing tension between national sovereignty and arbitral independence. The policy brief concludes by addressing the limitations of relying solely on domestic solutions and calls for systemic reforms at the international level, such as within the United Nations Commission on International Trade Law (UNCITRAL) Working Group III.
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Side Event to the 46th Session of the United Nations Commission on International Trade Law (UNCITRAL) Working Group III (WG-III) on Investor-State Dispute Settlement (ISDS) Reform
“Cross-cutting issues at the centre of developing countries’ concerns during the 46th UNCITRAL WG-III Session: Developing Countries’ Efforts Towards ISDS Reform”
Co-organized by the South Centre, Curtis, Mallet-Prevost, Colt & Mosle LLP, the Columbia Centre on Sustainable Investment and the International Institute for Sustainable Development (IISD)
9-13 October 2023
Vienna, Austria
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Side Event to the 46th Session of the United Nations Commission on International Trade Law (UNCITRAL) Working Group III (WG-III) on Investor-State Dispute Settlement (ISDS) Reform
“Cross-cutting issues at the centre of developing countries’ concerns during the 46th UNCITRAL WG-III Session: Damages at the Core of Discussion”
Co-organized by the South Centre (SC), Columbia Centre on Sustainable Investment, the International Institute for Sustainable Development (IISD) and the International Institute for Environment and Development (IIED)
9-13 October 2023
Vienna, Austria
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