The Catalogue of Circular City Actions and Solutions targets eight high-impact urban sectors: Built Environment, Consumer Goods, Food, Manufacturing, Mobility and Logistics, Tourism and Leisure, Waste and Material Management, and Water and Wastewater Management.

Each item in the catalogue has practical value for cities and regions, offering actionable strategies such as how to refurbish existing buildings, adopt regenerative urban farming, implement digital tools for circular manufacturing, or introduce greywater reuse systems. These entries often include tools, methodologies, case studies, and recommendations, for instance, how Milan’s neighbourhood food hubs redistribute surplus or how Amsterdam maps material flows for urban mining.

Depending on the nature of the solution, the catalogue supports different stages of Circular Systemic Solutions implementation: “Map” (e.g., identifying underused assets), “Design” (e.g., circular public procurement criteria), and “Implement” (e.g., composting systems or shared mobility platforms).