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
3 min
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 record-breaking $11 million sale at The Centennial Collection has set a new benchmark for luxury apartment living in Bondi Junction.
As interest rates, inflation and market sentiment fluctuate, investors are being urged to focus on data, not panic.
Australia’s housing affordability crisis is being fuelled by chronic undersupply, planning delays and rising development costs, as politicians continue to focus on the wrong solutions.
3 min
Australia’s housing crisis will not be solved by first-home buyer incentives or tax changes alone, with leading property figures warning governments must tackle supply constraints if affordability is to improve.
Speaking at the Kanebridge Quarterly Property Leadership Summit in Sydney last week, expert project marketing specialist Sam Elbanna, property investor and fund manager Paul Miron and property consultant Karla McNeice said that a lack of housing supply remained the central issue facing the market.
Elbanna, Director of CPM Realty with more than 30 years’ experience in project sales, argued that successive governments had focused too heavily on stimulating demand rather than addressing the barriers preventing new housing from being delivered.
“The misconception is that politicians think the way to solve the housing crisis is to drive demand,” he said.
“The reality is that’s not the way. This is a supply-side problem, and it needs to be solved on the supply side.”
Drawing on his experience in project sales, Elbanna said policies designed to help first-home buyers often had unintended consequences, pointing to previous grants that ultimately flowed through to higher property prices.
Instead, he said developers were facing increasing red tape, approval delays and rising costs, which were discouraging new housing supply.
“In the absence of stock, demand exceeds supply,” he said.
Miron, a Co-Founder and Fund Manager of Msquared Capital, said the housing debate had become overly focused on tax policy while overlooking broader structural issues.
He argued that affordability challenges stemmed from a combination of factors, including planning constraints, supply shortages, migration levels and interest rates.
“No-one can be 100 per cent certain on the real reason for property prices is going up,” he said.
“The reason why property prices are higher is a combination of interest rates, lack of supply, migration, vacancy rates and maybe taxes play a role.”
Miron was critical of recent federal housing policy changes, warning they could reduce the number of new homes being built and further constrain supply that was even highlighted in the budget.
He also highlighted the importance of the property sector to the broader economy, noting that residential real estate and related industries employed more than one million Australians.
McNeice, who advises developers on sales strategy and market intelligence, said understanding buyers had become increasingly important as affordability pressures intensified.
While affordability remained a major consideration, she said today’s buyers were focused on value rather than simply price.
“People are looking for value for money,” she said.
She said buyers were increasingly evaluating factors such as transport connections, walkability, nearby amenities and flexible living spaces that could accommodate changing family needs.
“What infrastructure is going on? Can I walk to the shops? Can I meet people at the local cafe?” she said.
The panel also discussed the mounting pressures facing developers, with Elbanna arguing that many projects become financially unviable from the moment a site is purchased.
“The viability of a development happens at the moment the site is bought,” he said.
He said rising construction costs, higher interest rates and overly optimistic feasibility assumptions had left some developers exposed as market conditions changed.
While acknowledging the growing number of smaller and first-time developers entering the market, Elbanna said property development required expertise across finance, construction, marketing and legal disciplines.
“It is actually a business that requires a level of expertise,” he said.
Looking ahead, the panel agreed opportunities remained in the market despite current challenges.
Miron said property should continue to be viewed as a long-term investment and cautioned against trying to time short-term market movements.
McNeice said success would increasingly depend on identifying projects that genuinely met changing buyer expectations.
Elbanna said affordable housing remained achievable, but developers needed to deliver more than just homes.
“We can provide affordable housing in this country,” he said.
“But we’ve got to wrap that affordable housing with the things that people want.”
As Australia’s housing affordability debate intensifies, the panellists agreed on one point: without a meaningful increase in housing supply, demand-side measures alone are unlikely to solve the nation’s property challenges.
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