As climate change, pollution, traffic congestion, and rapid urban growth put increasing pressure on cities, researchers are calling for a major rethink of how urban areas are managed. A new international study led by scientists from Zhejiang Gongshang University, Zhejiang University, the Chinese Academy of Sciences, the University of Copenhagen, and Université Paris Est Créteil argues that current "smart city" systems are no longer enough to deal with modern urban challenges. The researchers propose a new model called the "Smart-City-Brain" (SCB), which combines artificial intelligence, big data, digital technologies, and real-time monitoring into a single integrated system. Published in the Journal of Urban Management, the study says future cities must focus not only on efficiency but also on carbon neutrality, public health, resilience, and social equality. Why Current Smart Cities Are Falling Short Over the past decade, cities around the world have invested heavily in smart technologies such as traffic sensors, surveillance systems, digital infrastructure, and automated energy management. These systems have improved urban services and reduced some operational problems. However, the researchers say most smart city systems still work in isolation. Transportation departments, energy networks, healthcare systems, and environmental agencies often collect and manage data separately. This creates "data silos" that prevent cities from understanding how different systems affect one another. For example, electric vehicles may reduce road emissions, but if power grids are not prepared, electricity demand could rise sharply and increase dependence on fossil fuels. Similarly, traffic systems designed only to reduce travel time may encourage more car use and increase pollution instead of lowering it. The study argues that cities can no longer focus only on speed and efficiency. Instead, urban management systems must consider environmental and social impacts at the same time. The Rise of the Smart-City-Brain The proposed Smart-City-Brain framework aims to connect all