Algae Tower's photobioreactors absorb CO2, generate biomass, and regulate shade and heat season by season

Inside transparent tubes a few centimeters thick, attached to the outside of a building, flows a teal liquid that bubbles softly, absorbing carbon dioxide and producing oxygen as the sun shines through it. It is Algae Tower, the skyscraper that the Italian architect Gianluca Santosuosso he imagined for Melbourne, and which behaves, point by point, like a real tree would: it grows thicker when it is hot, and thins out when the sun is needed indoors.

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