Housing crisis? You ain't seen nothing yet. So how will the cities of tomorrow cope with an exploding population? Or with mass flooding caused by global warming? Or even when there is no space left to build on? Today's forward-thinking architects are already on the case, devising everything from horizontal skyscrapers providing midair communal areas and forests in the sky, to a floating metropolis and new cities built on the spires of the last. Welcome to the future. Now we just have to build it.



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