• Sustainable cities
• Smart cities
• Smarter eco-cities
• Smart sustainable cities
• Artificial Intelligence of City Things (AIoCT)
• Urban Artificial Intelligence (UAI)
• Artificial Intelligence of Things (AIoT)
• Urban Generative Artificial Intelligence (UGAI)
• City Brain
• Urban Digital Twin (UDT) 
• Smart Urban Metabolism (SUM)
• Platform urbanism 
• Environmental sustainability
• Environmental planning
• Environmental governance 
• Climate change mitigation and adaptation 
• Renewable energy and energy efficiency
• Sustainable smart transportation 
• Sustainable smart waste  management 
• Sustainability transitions
• Technological Innovation Systems (TIS)