• Local governance frameworks and policy instruments emerge as the core mechanism translating sustainable development into city-scale action, with Local Agenda 21 (LA21), proactive local authorities, and local action plans guiding implementation across European and UK contexts [4], [6], [10], [20].

• Place-based environmental management demonstrates how authorities, industry, and communities co-create solutions, evidenced by Ilo, Peru's innovative governance, urban agriculture initiatives, and Curitiba's integrated transport and planning efforts [5], [8], [20].

• Ecological footprint framing challenges conventional urban economics by foregrounding carrying capacity, material flows, and global ecological change as constraints shaping city sustainability [1], [15].

• Infrastructure-focused perspectives treat drainage, green infrastructure, and eco-city strategies as central levers, highlighting advances in urban drainage futures, engineering approaches, and sustainable urban design [3], [18].

• Regional megaregions and global interdependencies shape sustainability trajectories, illustrated by Southeast Asian mega-urban regions, Jakarta's development challenges, and international urban sustainability perspectives [9], [17], [15].