This article looks at five futuristic buildings that could serve as "urban lungs" to filter pollution from the air. One cell-like design uses rooftop hydroponic farms, absorbent cladding and titanium-dioxide treated precast concrete panels to clean the air. Another design, a seashell-shaped building, "seeks to be carbon negative and scrub CO2 ... while acting as a beacon for progressive change required to combat global warming," according to its designers.

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