In Germany, buildings are going green — literally — with the use of algae-filled tubes mounted on their exteriors. These transparent tubes house fast-growing microalgae that absorb carbon dioxide from the air and use sunlight to grow, all while producing valuable biomass. This living façade serves two purposes: it helps cool the building by providing shade and simultaneously generates biofuel as the algae are harvested and processed.

The system is known as a "bioreactor façade," and it's part of an ambitious effort to turn urban architecture into active components of the renewable energy ecosystem. The algae not only capture CO₂ emissions but also produce oxygen, making them natural air purifiers.

Once collected, the algae biomass can be converted into energy-rich biofuel, providing a clean, local source of power. Germany’s algae buildings demonstrate how cities can blend sustainability and design, transforming structures into living, breathing energy farms.

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