If I were designing a sustainable city, it would be built around people, not cars. Streets would prioritize pedestrians and cyclists, with wide, safe sidewalks, protected bike lanes, and plentiful green spaces connecting neighborhoods. Public transportation would be fast, frequent, and fully electric, including buses, trams, and trains, making it easy for residents to get around without needing a personal car. Car-sharing programs and electric vehicle charging stations would be available for trips where driving is necessary. Buildings would be energy-efficient, with rooftop solar panels, green roofs, and smart energy systems to reduce electricity use. Mixed-use neighborhoods would combine housing, shops, schools, and offices in close proximity to reduce travel needs. Parks, community gardens, and urban forests would provide clean air, spaces for recreation, and areas to absorb carbon. Waste would be minimized through recycling, composting, and circular design practices that encourage repairing and repurposing items. Food systems would also be sustainable, with local farms supplying fresh produce and markets, reducing transportation emissions. Water would be conserved through smart irrigation and rainwater harvesting systems, and the city would prioritize renewable energy sources for electricity and heating. I think living in a city like this would be very appealing. It would feel cleaner, quieter, and healthier, with easier access to nature and less traffic stress.