Fostering Sustainable Cities through Resilience Thinking: The Role of Nature-Based Solutions (NBSs): Lessons Learned from Two Italian Case Studies

Adopting an interdisciplinary approach and framing sustainability issues from a resilience perspective, our paper first aimed to highlight nature-based solutions (NBSs) as levers to foster sustainable cities consistent with Agenda 2030-SDG 11 (2015) and the New Urban Agenda (Habitat III, 2016). Second, we empirically analyzed two Italian municipalities that are experimenting with initiatives of sustainable urban management and planning based on NBSs: the Municipality of Lucca in Tuscany and the Municipality of Latina in the Latium Region. These municipalities present institutional and socioeconomic similarities, making them an interesting study setting that allows us to draw significant lessons. We conducted four research steps: (1) theoretical background analysis, including resilience thinking in sustainable urban management. We investigated the role of NBSs in enabling urban resilience according to the last level of resilience, i.e., the transformative level. (2) We studied the contributions of NBSs to sustainable cities and resilience thinking. (3) We analyzed the NBSs' projects of Lucca and Latina, and (4) we proposed an urban managerial tool: the NBSs' curve, which facilitates the estimation of the NBS ecosystem endowment. The results of the NBS initiatives presented in this study have a two-fold value. First, they aim to combine citizens' well-being with ecological and environmental aspects by better managing urban spaces that facilitate interpersonal relationships and resource sharing. Second, they are developed to meet the needs of local groups by serving as a stimulus (Fridays For Future movement) and as enablers (local associations) of managed actions. The lessons learned about the enhancement of sustainable cities through NBSs were thoroughly debated.