Islands around the world are disproportionately affected by climate change, and their adaptive capacity is generally lower than that of mainland areas. Ecosystems play a vital role in supporting the well-being of island communities; however, their response to climate change has not been thoroughly assessed. Following the PRISMA methodology, this study presents a systematic literature review that examines studies on the impacts of climate change on island ecosystem services worldwide. Our findings highlight that island ecosystem services studies are increasing over time. About 60% of studies that explicitly focused on climate impacts report adverse effects on these services, predominantly impacting marine ecosystems (including fisheries and coral reefs), with significant but less frequently studied effects on terrestrial ecosystems. Climate factors such as rising temperatures, increased sea levels, and extreme weather events are commonly associated with negative impacts on island ecosystems. These effects are intensified by the combined influence of non-climatic factors, particularly land-use changes. Although island ecosystem services hold potential for nature-based solutions towards climate mitigation, their effectiveness is limited by knowledge gaps and insufficient policy-driven adaptation strategies. Addressing these gaps is essential to support sustainable adaptation and resilience in vulnerable island communities.

European islands are hotspots of biological and cultural diversity, which, compared to mainland, are more vulnerable to climate change, tourism development, uncontrolled land-use changes and the consequences of financial crisis. These drivers of change have increasingly resulted in severe impacts on socio-economic and environmental parameters. Projected climate, land-use and socio-economic change will impact on islands’ biodiversity, ecosystem services and, in turn, on the quality of life of island inhabitants. Even if the existing methods can adequately predict the abovementioned changes of the larger islands, this is not the case for small and medium-size islands, where there is a need for refinement. Although ecosystem services (ES) assessments have been carried out worldwide in different geographical areas, islands are still under-represented. Despite the recognised islands’ importance and vulnerability, efforts to date have focused solely on the pressures they face. Still, we know little about ES supply, flow and demand and their spatio-temporal variability, whilst integrated approaches that consider ES cross-island realms (terrestrial, marine and their interface) remain scarce. Even more under-represented are studies that explore the telecoupled relationship amongst islands and their mainland counterparts. Moreover, the current conceptual approaches guiding ES mapping and assessment need further refinement to account for the complex manifestations of nature and culture arising from peoples’ interaction with island spaces. This paper discusses the creation of a platform for coordinated interdisciplinary research on several aspects of mapping and assessment of ES in small and medium European islands in order to synthesise and strengthen the knowledge base for conservation of island realms and contribute to their sustainable development.

The Jordan Valley (JV) is a critical region where the interplay of water, energy, food, and ecosystem (WEFE) dynamics presents both challenges and opportunities for sustainable development and climate change mitigation and adaptation. In such a transboundary river basin with acute nexus problems and a long history of conflicts, it is essential that conscious efforts are made to pluralize the debate and actively encourage stakeholders' empowerment, participation and fair collaboration in strategic planning. An integrated framework for participatory strategic planning in the WEFE nexus is proposed, which has been developed in the context of the JV case study. The nexus approach emphasizes decentralized, but coordinated decision making as the source of solutions, based on a clear understanding of the challenges faced. The engagement process consisted of living lab sessions where Causal Loop diagrams facilitated discussions with stakeholders by visualizing the complexity and interdependence of WEFE sectors and prioritizing the challenges faced. Community capacity assessment appraised the capacities of each community, identifying barriers to addressing their priorities. Finally, the gap analysis bridged the baseline understanding with actionable targets. The results not only highlight the pressing challenges, priorities, and leverage points for each territory but also outline pathways for fostering resilience and adaptation to the region's intertwined crises. The priorities and capacities across the three territories of the JV reveal significant disparities, reflecting the diverse socio-political, environmental, and economic contexts of the region. The methodologies and overall framework may be replicated in other regions with similar climate and challenges around the world.