One idea is for a "plant-based city".
"London architecture graduate Richard Hardy's three-minute video, The Transcendent City, imagines a plant-like 'future sustainable city' that will automatically adapt to its environment. Hardy says his vision of a vegetable-like structure with plant and animal motifs is developed for a society that is 'currently not responding effectively to environmental dangers'. It is 'an autonomous artificial machine that extends across the earth, adapting to the natural eco-systems it encounters while deriving its energy from the renewable resources available at each site.' One webviewer commented: 'A beautiful vision, but one that doesn't explain how this would function as a city.'"