Embedding Climate Commitments in Bilateral and Multilateral Trade Agreements: A Comparative Study of Enforceability and Sovereignty in EU-Mercosur and CPTPP

Abstract

The accelerating climate crisis necessitates innovative policy integration across governance domains, including international trade. This paper critically examines the evolving practice of embedding climate change mitigation and adaptation commitments within bilateral and multilateral Free Trade Agreements (FTAs), focusing on the critical tensions between legal enforceability and national
sovereignty. Through a comparative case study analysis of two significant yet contrasting agreements, the ambitious but contested EU-Mercosur Association Agreement and the flexible, cooperative Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), the research investigates how climate clauses are designed, whether they are enforceable, and how they impact the sovereign policy space of signatory states. The analysis reveals a fundamental dilemma. The EUMercosur
model, featuring a binding commitment to implement the Paris Agreement, specific forestry obligations, and a novel sanction-based enforcement mechanism, represents a significant step towards closing the "enforcement gap" of traditional soft-law approaches. However, it generates substantial friction with sovereignty, particularly for Mercosur states, creating policy lock-in, asymmetric burdens, and perceived coercive conditionality that has stalled ratification. Conversely, the CPTPP model explicitly affirms sovereign rights to set environmental priorities and relies primarily on non-binding cooperation and dialogue, excluding most climate provisions from its state-to-state dispute settlement. While this minimizes sovereignty constraints and accommodates diverse capabilities, it results in weak enforceability and marginal effectiveness in driving enhanced climate ambition. The paper argues that neither model offers an optimal solution. The high-conditionality approach risks political backlash and implementation hurdles, while the cooperative model fails to leverage trade governance effectively for urgent climate action. Effectiveness hinges on achieving a nuanced balance. Future FTA design must incorporate differentiated obligations aligned with the principle of Common But Differentiated Responsibilities and Respective Capabilities (CBDR-RC). Graduated enforcement mechanisms, progressing from cooperation to expert panels and reserving targeted sanctions only for egregious violations of core commitments are essential. Crucially, meaningful effectiveness and equity require integrating robust, binding support mechanisms (finance, technology transfer, capacity building) for developing countries, alongside unambiguous safeguards for the right to regulate for climate protection across all relevant chapters. Only through this sophisticated balance of obligation, support, and respect for sovereignty can trade agreements become credible instruments for advancing global climate governance.