Legal complexity undermines effective climate policy implementation

This study examines the implications of growing legal complexity in climate policy on the implementation of climate legislation, focusing on the European Union (EU). While complex legal frameworks may be necessary to address the multifaceted challenges of climate change and to accommodate diverse stakeholder interests, this complexity can undermine policy implementation. The analysis highlights that EU climate laws have become increasingly intricate over the past decades, characterized by longer texts, greater detail, conceptual diversity, and extensive cross-referencing. Using a complexity score derived from structural, linguistic, and relational indicators, the study demonstrates that higher levels of legal complexity correlate with greater implementation deficits. The findings reveal that these challenges persist irrespective of a state's administrative capacity. Although higher administrative capacity slightly improves compliance, it cannot fully mitigate the negative effects of complex legislation. The study underscores the importance of striking a balance between legal complexity and feasibility during policy formulation. While complexity may enhance precision, inclusivity, and public support, it also raises transaction costs for policymakers and administrators, reducing the overall effectiveness of climate action. Policymakers are urged to ensure that implementation capacities are aligned with the demands of complex legislation. As the EU continues to lead global climate efforts, addressing the balance between necessary complexity and implementation feasibility is critical to ensuring the success of its climate policies, with implications for other regions adopting similar legal frameworks. Rather than relying primarily on post-adoption remedies – such as additional guidance, training, or enforcement – policymakers should prioritize complexity reduction during legislative drafting. Simplification efforts should be surgical rather than blunt. Policymakers can preserve substantive ambition while improving feasibility by reducing unnecessary detail and micro-specification, improving linguistic clarity and consistency of concepts, and limiting intra-text dependencies that force implementers to interpret multiple provisions simultaneously. Effective climate action depends not only on ambitious targets, but on laws that can realistically be implemented. Aligning legal complexity with administrative feasibility at the drafting stage is potentially a critical, and currently underused, lever for improving real-world climate policy performance.