Copenhagen is an active member of the Global Platform for Sustainable Cities (GPSC) Urban Nature Network, contributing its long-standing experience in integrating nature-based solutions, climate adaptation, and circular economy practices into urban planning. Globally recognized as one of the most sustainable cities, Copenhagen has pioneered green infrastructure, stormwater management, and low-carbon mobility systems that enhance both resilience and quality of life. Through its participation in GPSC workshops and peer-learning exchanges, the city shares lessons from its Climate Adaptation Plan and Green Roof Strategy, which demonstrate how nature and design can coexist to mitigate flooding, improve biodiversity, and foster social well-being. Copenhagen’s leadership exemplifies how cities can achieve ambitious climate goals while creating vibrant, inclusive, and nature-positive urban environments.