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.”
Copyright 2020, Dow Jones & Company, Inc. All Rights Reserved Worldwide. LEARN MORE
Rugged coastal drives and fireside drams define a slow, indulgent journey through Scotland’s far north.
A haven for hedge-fund titans and Hollywood grandees, Greenwich is one of the world’s most expensive residential enclaves, where eye-watering prices meet unapologetic grandeur.
Australia’s wealthy class is expanding fast, and Knight Frank says that a surge in billionaires is reshaping the nation’s luxury property market.
3 min
Australia’s luxury property market is being quietly reshaped by one of the most significant wealth expansions in the world.
According to Knight Frank’s latest Wealth Report, the country’s billionaire population is set to grow by 77 per cent over the next five years, rising from 48 to 85 individuals.
That surge sits within a broader wave of wealth creation. Ultra-high-net-worth individuals, those with more than US$30 million, are forecast to increase by nearly 60 per cent to over 26,000 Australians by 2031.
Globally, the pace is accelerating. The report reveals that 89 new ultra-wealthy individuals are created every day, a figure that underscores a structural shift in capital formation rather than a cyclical upswing.
For luxury property markets, this is not just a headline number. It is a demand driver.
Australia’s wealth story is increasingly underpinned by diversification across resources, finance, technology and services, creating a depth of private capital that is both mobile and strategic.
And mobility is key. The ultra-wealthy are no longer tied to a single market. Instead, they are operating across multiple global hubs, maintaining footholds in cities like London, New York and Singapore, while using Australia as a stable base.
In this environment, real estate becomes less about shelter and more about positioning. Trophy assets remain desirable, but capital is increasingly being deployed across the full risk spectrum, from long-term holds to value-add opportunities. For Australia, the implications are clear. As wealth expands, so too does the expectation of product, and the locations that can attract it.
The billionaire effect
While property remains central to wealth preservation, the latest data shows that capital is increasingly spreading across luxury asset classes, albeit with a more disciplined approach.
Knight Frank’s Luxury Investment Index recorded a modest 0.4 per cent decline in 2025, signalling a stabilisation phase after several years of correction.
But beneath that headline number is a more telling shift. Collectors are moving away from speculative buying and toward assets defined by rarity, provenance and cultural significance.
Impressionist art led the market, rising 13.6 per cent, buoyed by landmark sales including a US$236 million Klimt painting. Watches also performed strongly, up 5.1 per cent, driven by continued demand for brands like Patek Philippe and Rolex.
At the same time, more volatile categories have corrected. Whisky values fell 10.9 per cent, while parts of the fine wine market have softened following pandemic-era highs.
Perhaps the most notable trend is behavioural. Younger investors are entering the market through fractional ownership platforms, gaining exposure to high-value assets that were once out of reach.
For property, the parallels are clear. The same focus on scarcity, narrative and long-term value is increasingly shaping buying decisions at the top end of the residential market.
Global wealth
The growth in billionaires is not just increasing demand, it is changing where that demand is directed.
In Australia, Brisbane has emerged as one of a handful of global cities experiencing rapid change in its luxury positioning. The city’s transformation is being driven by infrastructure investment and the 2032 Olympics, with top-end apartment prices rising from around US$6 million to more than US$10 million in just 12 months.
Luxury price growth has remained steady, with Brisbane rising 2.1 per cent in 2025, while the Gold Coast recorded 2.8 per cent.
At the same time, buying power is tightening. US$1 million now buys 5 per cent less in Brisbane than it did five years ago, reflecting the upward pressure on prime markets.
The trend is not confined to capital cities. Regional lifestyle markets are also capturing attention. Geelong’s waterfront has been identified as one of the world’s hottest luxury residential markets, driven by a combination of coastal amenity, infrastructure and relative value.
In these markets, pricing is no longer the sole driver. Lifestyle, accessibility and long-term growth are increasingly shaping buyer decisions, particularly among globally mobile wealth.
Alternative luxury assets
Beyond residential property, high-net-worth individuals are continuing to diversify into alternative assets that combine lifestyle and investment potential.
One of the most compelling examples is vineyard investment. Knight Frank’s Global Vineyard Index highlights the Barossa Valley as one of the best-value wine regions globally, where US$1 million can secure more than 18 hectares of land.
Despite a 10 per cent decline in land values over the past year, the broader outlook remains positive, particularly as the global wine industry shifts toward premiumisation.
This “trading up” trend is seeing consumers favour higher-quality, provenance-driven wines over mass-market products, reinforcing the long-term appeal of established regions like the Barossa and Eden Valleys.
For investors, the appeal lies in the intersection of lifestyle and capital preservation. Vineyard assets offer not only production potential, but also a narrative — something increasingly valued in a market where experience and authenticity carry weight.
