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Transit-oriented development (TOD) is reshaping cities for a low-carbon future. By clustering homes, offices, and amenities around public transport hubs, TOD reduces car dependence, lowers emissions, and creates walkable, vibrant communities. Case studies from London, Stockholm, Paris, and Barcelona show how density, connectivity, and mixed-use design improve air quality, public health, and urban livability. TOD is not just urban planning-it’s a blueprint for cities without cars.