Tomorrow's cities: Just how smart is Songdo?

The waste disposal system is also impressive - or it would be if you could see it. Because there are no rubbish trucks trawling the streets or vast bins dotted around blocks of flats. Instead, all household waste is sucked directly from individual kitchens through a vast underground network of tunnels, to waste processing centres, where it's automatically sorted, deodorised and treated to be kinder to the environment.

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