Algae don't cover the building like, say, ivy. Instead, the sun-facing walls sport bioreactors that use sunlight to grow the tiny plants, which will receive continuously circulating liquid nutrients and carbon dioxide. Periodically the algae will be harvested for fermentation, forming a gas-emitting biomass meant to produce all the building's heat, hot water and electricity (the system is scheduled to begin operations later this month). The algae-growing facade panels also harvest solar energy, which can be stored in brine-holes dug more than 250 feet into the ground.
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