Co-creation Pathway for Urban Nature-Based Solutions: Testing a Shared-Governance Approach in Three Cities and Nine Action Labs

Nature-based solutions (NBS) implementation in urban contexts has proven outcoming multiple benefits to reverse the current trend of natural resources’ degradation adversely affecting biodiversity, human health, and wellbeing. Yet, the current urban-planning policy frameworks present a rigid structure to integrate NBS definitions, and their co-benefits to get mainstreamed and up scaled on a wider urban spatial dimension. In this research, we test a complete co-creation pathway that encourages decision-makers to embed citizen engagement methodologies as an approach to co-design and co-implement NBS in shared-governance processes aiming to increment the greening of urban spaces, towards more inclusive and climate resilient cities. On one hand, we assess a tendency to involve a multiplicity of stakeholders that collaborate to the establishment of an Urban Innovation Partnership (UIP) aiming at increasing the social awareness around NBS themes, and at the same time tackling both financial and governance aspects. On the other hand, the innovation embedded in NBS paves the way to combine a multi-scalar flexibility in implementation tools and place-based urban actions, hence resulting in widespread economic, environmental, and social impacts in place. The novelty in embedding the co-creation process in urban-planning practice lies in catalyzing resources towards the transposition of research into practice through policy and planning tools for local authorities and decision-makers. Three front-runner cities (Hamburg, London, and Milan) are under investigation as part of Clever Cities—a Horizon 2020 project—aiming at implementing NBS in diverse urban-regeneration processes, through nine up-running Urban Living Labs (ULLs). Grounded on a comparative analysis of these three cities, key characterization for NBS implementation framework could be categorized into: (1) current urban-planning greening strategies in each context, (2) specific environmental and societal challenges addressed, (3) different typologies and scales of NBS integration within urban morphologies, (4) specific governance process as response to co-design and co-implementation processes, and (5) availability of financial investment and main stakeholders. As research results, we emphasize using co-creation approach in urban planning to embed and upscale NBS in an inclusive shared-governance process, hence contributing to social awareness and acceptance. Meanwhile, spatial, and financial challenges could be majorly resolved using a multi-scalar approach to manage newly embedded urban-greening policies at the urban level. Lastly, the implementation scale of NBS with local communities requires a radical paradigmatic shift in societal, individual and administrative urban-planning practices.