Uncertainty and Tension in Constitutional Adjudication of Climate Mitigation

Abstract In recent years, courts across the world have increasingly held governments accountable for addressing climate change. While such rulings have fueled optimism about constitutional law as a vehicle for climate ambition, this Article argues that the role of constitutional law in advancing climate goals is far more complex and contested. Constitutions encapsulate diverse and sometimes conflicting values, which can create tensions when courts adjudicate climate policies. As government climate measures become more concrete, conflicts arise between rights, institutional structures, and political realities. Drawing on examples from Germany, Canada, and Mexico, this Article highlights the challenges of adjudicative uncertainty, the underspecificity of constitutional norms, and the polyvocality of constitutional values in the context of climate change. This Article concludes with recommendations for judges to adopt a principled, context-sensitive approach to constitutional climate adjudication, balancing the urgency of climate action with the complexities of state capacity and constitutional structures.