Medellín, Colombia's second-largest city, is at the core of the Metropolitan Area of the Aburrá Valley, a legally established metropolitan authority comprising ten municipalities. This entity facilitates coordinated urban planning, transportation, and environmental management across the metropolis, promoting integrated development and service delivery.
Medellín sets the bar for regional sustainability and accessibility. With CO₂ emissions per capita at 0.22 metric tons in 2020, Medellín’s CO₂ emissions show a modest 5% increase since 1975, leading Latin American cities. The city’s greenness index of 0.5 in 2025 and public transport accessibility of 99% also represent the best regional performance, showcasing Medellín’s efforts towards building sustainable and livable urban environments.
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