This concluding chapter synthesizes the central arguments of Nature in Cities, Nurturing Cities, reframing the relationship between nature and urbanism as a structural, rather than supplementary, dimension of city-making. The book illustrates how nature is essential to ecological stability, social cohesion, cultural identity, and physical and mental health through three thematic pillars: human wellbeing, climate resilience, and social belonging. It makes the case for a paradigm change away from discrete interventions like parks and cooling techniques toward systemic initiatives that integrate natural processes into the very metabolism of urban systems. Looking ahead, the chapter positions nature-based urbanism as the next frontier: a paradigm in which design, planning, governance, and policy are all influenced by nature as essential infrastructure. It ends by urging academics, professionals, and decision-makers to continue this agenda and imagining cities as adaptive living systems, where ecological and human life co-evolve. This shifts the focus from cities that only host nature to cities that develop from it, establishing the theoretical groundwork for more resilient, just, and regenerative urban futures.