The document discusses the changing nature of cities and territories over time. It advocates for a 15-minute city model where most daily needs are within a 15-minute walk or cycle. This model promotes proximity, sustainability, and quality of life through mixed-use neighborhoods, pedestrian-friendly streets, and access to services, work, education and leisure activities locally. The document presents examples of cities implementing aspects of the 15-minute city concept and argues it can help address challenges of climate change, public health crises, and social isolation.