Integrated Urban Governance of the Biodiversity–Climate–Health Nexus: Synergies, Blind Spots, and Transformation Diagnostics

Cities are pivotal arenas for responding to interconnected climate, biodiversity, and health crises: they host most of the world’s population, consume most resources, and disproportionately influence ecological integrity. Yet even within the European Union—the world’s most advanced environmental governance regime—urban biodiversity–climate–health (BCH) governance remains fragmented, underscoring the difficulty of operationalizing nexus thinking in practice. Drawing on the IPBES–IPCC climate–biodiversity–society nexus framing, this study provides a comparative assessment of how four EU urban areas with well-developed BCH agendas—Cork, Klagenfurt, Päijät-Häme, and Malta—govern BCH interlinkages.

We present a goal-oriented analytical framework spanning 23 action fields across climate mitigation/adaptation, biodiversity protection, public health, water management, and food-related ecological impacts. To evaluate the depth of policy change, we introduce a transformation assessment diagnostic that distinguishes incremental, reformistic, and transformative actions—offering a novel, operationalizable method for evaluating BCH nexus governance. Using this combined framework, we analyse 32 strategic planning documents to examine how cities mobilize synergies, address trade-offs, and embed nature-based solutions (NBS) as systemic response options.

Our findings show that biodiversity concerns are most effectively mainstreamed in multi-benefit NBS—including ecological restoration, green–blue infrastructure, riparian corridor enhancement, and nature-based mobility routes—that jointly support urban cooling, habitat connectivity, stormwater regulation, mental health benefits, and local species recovery. However, these synergistic interventions are often small-scale and project-based, rather than embedded in long-term land-use planning or aligned with water, food, and material consumption policies.

Across all four cities, we identify five persistent blind spots limiting transformative BCH governance: (1) Fragmented mid-level targets that fail to translate biodiversity goals into measurable actions; (2) Land-use contradictions undermining ecological connectivity; (3) Neglect of indirect emissions and telecoupled biodiversity impacts from food systems, biomass sourcing, and material imports; (4) Institutional silos separating climate, biodiversity, health, water, and planning domains; (5) Dependence on soft governance tools, with few binding mechanisms to ensure cross-sectoral integration.

By operationalizing the nexus theory through a structured diagnostic and empirically identifying governance blind spots, this study shows that significant innovation is required—even under high-capacity EU conditions—to realise coherent, biodiversity-positive transformations. Our framework provides a transferable method for evaluating and advancing BCH nexus governance globally.