Nature-based solutions across spatial urban scales: three case studies from Nice, Utrecht and Milan

A holistic vision for urban sustainability looks at the city as an integration of energy, environment, mobility, urban design, new technologies and, most importantly, ‘people and nature’. In this article, the aim is to shed light on the role of nature-based solutions (NBS) towards addressing climate change crisis and tackling a variety of socio-ecological and urban biodiversity challenges. The paper claims for more evidence-based frameworks to understand the economic, social and environmental benefits of NBS and to promote their inclusion in urban policies. First, and most importantly, the role of NBS in shaping urban planning as a result of expansion and densification of cities is reviewed. Second, the co-benefits generated by NBS within the social and cultural regeneration of cities are reflected upon. Lastly, case studies are given from Nice, Utrecht and Milan in order to showcase those cities’ spatial strategies to implement NBS through different scales. The article discusses the role of NBS in addressing climate challenges and emphasises the need for collaborative stakeholder engagement in their implementation. Spatial, governance and temporal challenges related to NBS implementation are identified, underscoring the complexity of integrating NBS into urban environments. The article concludes by advocating for systematic integration of green and blue infrastructure and NBS into urban planning, emphasising the importance of considering socio-cultural elements alongside environmental benefits.