In San Francisco, the need for rapid development is also top of mind, as housing shortages have caused yawning inequities and exacerbated homelessness.
Concrete is the bedrock of the built environment. It supports the foundations of homes, the bones of office buildings and the sidewalks underfoot.
That concrete has been processed and poured across several projects in the Bay Area, supporting local infrastructure but with a little less impact on the planet. “We basically give limestone superpowers to accelerate its ability to absorb CO₂ in just three days,” said Alexa Dennett, Heirloom’s head of marketing and communications. The process would take years in the natural environment, she noted.
In her State of The City address on Thursday, Mayor London Breed outlined a plan to construct 82,000 new units across The City to boost the economy, add jobs and revive the vacated downtown corridor. “We must build, and we must build now,” Breed said. Found in Mayan ruins from as far back as 850 A.D, concrete has had remarkable staying power. Its quick-drying mix allowed revolutionary advances in architecture and infrastructure, including the Roman Colosseum’s undulating arches and the Pantheon’s unreinforced dome.
Still, she said, “concrete is not actually very carbon intensive compared to other building materials. But because of the scale, because it’s the second most consumed material on the planet, that’s why concrete has a very measurable CO₂ footprint globally.” “It’s all around us. It’s a huge industry. It’s the most abundant man-made material on the planet. And putting a dent in those emissions is a real, meaningful change,” said Misra. “We retrofit concrete plants to turn them into mini carbon removal factories.”
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