Inhabitat's Week in Green: of space elevators, floating cities and solar sheltered drinking machines

Engadget: This week Inhabitat showcased several incredible examples of futuristic architecture, starting with an epic floating ark that houses a self-sustaining city at sea. We also saw a plan to harness carbon nanotubes to create the world's first space elevator, and we brought you an ingenious solar-powered shelter that harvests and purifies rainwater for drinking.

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