Concrete Is One of the World’s Worst Pollutants. Making It Green Is a Booming Business.
The material accounts for more than 7% of global carbon emissions, according to some estimates
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Bill Gates , Jeff Bezos and former Los Angeles Laker Rick Fox are part of a new wave of investors and entrepreneurs looking to make one of the world’s worst pollutants greener.
Concrete accounts for more than 7% of global carbon emissions, according to some estimates. That is roughly the same as the CO undefined produced by all of India and more than double the amount produced by the global aviation industry.
Most of those emissions are caused by cement, the glue that binds together sand and gravel to make the concrete used to build roads, bridges and tall buildings.
Concrete, the second-most-used material in the world after water, is popular because it is cheap, relatively easy to produce, fire-resistant and extremely strong.
“It’s the most democratic material,” said Admir Masic , an associate professor of civil and environmental engineering at the Massachusetts Institute of Technology.
It is also very, very dirty. Cement is made by heating limestone and clay at around 2,700 degrees Fahrenheit in giant kilns and turning them into marble-sized granules called clinker, which are then turned into a powder and mixed with other materials. As it heats up, the limestone releases a lot of CO undefined , and the whole process is often powered by fossil fuels such as coal or gas.
Big cement producers and startups including Brimstone and Partanna, a startup based in the Bahamas and headed by three-time NBA champion Fox, are developing new technologies to produce cement while producing less CO undefined . Breakthrough Energy Ventures, which was founded by Gates and is backed by Bezos, Jack Ma and Michael Bloomberg among others, Fifth Wall and other venture firms have poured tens of millions of dollars into these companies.
These companies are being motivated in part by the federal government, which is dishing out grants and setting aside billions to decarbonise materials such as cement. Local regulators are also encouraging these new technologies. California in 2021 passed a law to cut emissions from cement and New York in 2023 issued rules that limit emissions on concrete used in state-funded construction projects.
Some companies are trying to make cement from different materials that are less polluting. Brimstone said it developed a way to make cement from rocks that contain no carbon. The company said it has raised around $60 million in venture funding to date.
Others are selling substitutes for cement so that concrete mixers need less of it. Eco Material Technologies, for example, harvests coal ash from landfills and volcanic ash from mines and sells it to concrete mixers. These substitutes aren’t new, but the company says it has worked out ways to increase its share in concrete.
“Our goal is to be able to use the last several generations of trash as the next several generations of greener concrete,” said CEO Grant Quasha .
Still others are removing pollutants from the air. The Halifax, Nova Scotia-based startup CarbonCure came up with a process to pump CO undefined into concrete as it is being made and raised $80 million in venture funding this past year.
Partanna, which uses brine from saltwater desalination to make concrete, said homes made from its material suck carbon out of the air.
It is unclear if the greener concrete alternatives will ever catch on broadly. Building codes have rigid rules on what concrete must contain, and many builders don’t like to try out new materials, Masic said.
Cost is another issue. Eco Material’s most environmentally friendly cement alternative, for example, costs around twice as much as standard cement, according to Quasha. CEO Cody Finke said Brimstone’s cement will be as cheap or cheaper than the common sort, but the company has yet to build a factory.
“If I go to the developing world and tell them you’re going to have to pay 20% more for your cement, they won’t do it,” said Eric Toone , a managing partner at Breakthrough Energy Ventures.
Even if some of these new technologies succeed, the startups have yet to prove that they can produce green cement at the vast quantities needed to make a dent in global warming.
Still, Toone said cement makers have no choice but to find cheap ways to cut emissions because ditching the material isn’t an option.
“Cement is sort of this wonder material,” he said. “It’s so cheap, it’s so valuable, it’s so good for what we need that it’s really hard to think of ways around it.”
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A vibrant 1954 Palm Springs home featuring eight colorful murals by late artist Shawn Savage is on the market for $2.295 million. The 2,237-square-foot property features bold hot-pink doors, three bedrooms, a pool, mountain views and playful interiors blending modern glamour with classic Palm Springs style.
3 min
A bold 1950s home in Palm Springs, California, adorned with eight colorful murals by the late artist Shawn Savage, is coming to market ahead of the city’s annual Modernism Week.
The white stucco home on El Camino Way, built in 1954 and recently renovated, has an asking price of $2.295 million. Its staggered facade features three playfully abstract murals on either side of double-height hot pink doors.
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The sellers are Los Angeles-based partners John Freeman and Mathieu Faure, who knew it was “the one” when they saw it after several months of searching in the winter of 2023. “It’s a happy house,” Freeman said. “We really liked the feel of the house: the uniqueness, the openness, the brightness—and the art.”
Located in the Mesa neighborhood of Palm Springs, which backs up to the San Jacinto Mountains, the 2,237-square-foot house features three bedrooms, an angled bonus room and a yard with a pool, desert mountain views and another colorful mural running alongside the pool.
“I never thought in my life I would have a house with pink doors,” said Faure, a producer at Apple TV who is originally from Paris. “It’s so colorful, it’s so different. And so Palm Springs.”
The layout of the home creates a smooth flow from the front doors through the open-plan common area—a foyer, bar, and living and dining room—into the kitchen around a fireplace wall and out to the yard. A corridor leads to a private bedroom wing, where the primary suite has floor-to-ceiling windows and the primary bath is only a tad smaller than the bedroom.
Faure has filled the home with Jonathan Adler furniture, rugs and accessories, riffing on the energetic California vibes of the house to create an aesthetic of “modern American glamour,” he said.
“It was enjoyable for me to play with different types of furniture and make this house ‘happy chic,’ as I describe it,” he said.
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“He did a fantastic job,” said Freeman, who is an attorney and consultant. “It does kind of bring a smile to my face whenever I walk into the house.”
Since the furniture and decor were chosen for the particularities of the space, the couple is open to selling them with the home. Their West Hollywood house is already furnished; the collection doesn’t match the vibes of a Houston loft they bought near family; and Faure can’t imagine these pieces in New York—where he’s lived in the past—he said.
The duo bought the Palm Springs house for $1.925 million in 2024, according to property records, and will list the home Monday. They are represented by Stewart Smith, Patrick Jordan and Kevin Stanley of Bennion Deville Homes/Luxury Portfolio International.
The previous owners had purchased the home in 2021 for $975,000 and then spent more than two years and $700,000 on the renovation, according to Realtor.com. They commissioned Savage, a local Palm Springs artist and painter known for his joyful abstract work, to decorate the home.
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Savage, who died in 2024, lived in the Coachella Valley from 2003, and his work can be found in various local institutions and is on exhibit at the Illumine Gallery in Palm Springs. “Some artists pass through a place. Shawn Savage became a part of it,” the gallery’s description states.
Unsurprisingly, the murals invite lots of friendly conversations, as well as guided tours and interested lookers, but never to a degree that it disturbed the peacefulness of their home or the neighborhood, the sellers said. “It felt like living in an art gallery, and you have the exterior that you would share with the world,” Faure explained.
The neighborhood also played a role in their decision to buy, because of its access to the hiking trails of the San Jacinto Mountains, the lack of through-roads and the neighborly environment.
“It’s a very friendly place,” Faure said.
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