Meet the 33-year-old Canadian chemist and the renowned MIT professor who are building the ‘electric vehicle of cement making’
Leah Ellis and Yet-Ming Chiang
Photo courtesy The Engine
While Leah Ellis was earning her doctorate at Dalhousie University in Nova Scotia, she was part of a team that did battery research for Tesla. After she graduated, her budding career took an unusual turn.
“I could have gotten an easier job with my background in battery materials — a lot of my colleagues go work for Tesla or Apple. I could have done that, … and I would have made more money at first,” Ellis, 33, told CNBC by phone Wednesday.
Instead, Ellis applied for and won a prestigious Banting Postdoctoral Fellowship that granted her two years’ salary to work with whomever she wanted.
Ellis took her Ph.D. in electrochemistry and went to work for Yet-Ming Chiang, a renowned material sciences professor at Massachusetts Institute of Technology who is also a serial clean-tech entrepreneur. Chiang co-founded companies such as American Superconductor Corporation, A123 Systems, Desktop Metal, Form Energy and 24M Technologies.
Now Ellis is working to scale up a new climate-conscious process of making cement, one powered with electrochemistry instead of fossil fuel-powered heat.
Making cement using electrochemistry was Chiang’s idea, Ellis told CNBC in Boston at the end of May. Ellis said she worked with Chiang in 2018, just after he had started Form Energy, a long-duration battery company, and he was thinking about the abundant intermittent energy that was being generated by renewable energy sources such as wind.
“Sometimes people will pay you to take energy off their hands,” Ellis told CNBC. “Instead of putting that energy in a battery, what if we can use this extra low-cost renewable energy to make something that would otherwise be very carbon-intensive? And then the first on the list of things that are carbon-intensive — it’s cement.”
Cement is a necessary ingredient in concrete, which is the cornerstone of global construction and infrastructure, because it’s cheap, strong and durable. Four billion metric tons, which is the equivalent of 50,000 fully loaded airplanes, of cement is produced each year, according to a 2023 report from management consulting company McKinsey. The value of the market was $323 billion in 2021 and is expected to reach $459 billion by 2028, according to SkyQuest Technology Consulting.
Cement powder is conventionally made by crushing raw materials, including limestone and clay, mixing with ingredients such as iron and fly ash, and putting it all into a kiln that heats the ingredients up to about 2,700 degrees Fahrenheit. That process of making cement generates approximately 8% of global carbon dioxide emissions, which are a leading cause of global warming.
When Chiang had the idea to electrify cement manufacturing, he turned to Ellis. “He’s super busy, so he was like, ‘Go off and figure it out,'” Ellis told CNBC.
So she did.
In 2020, Ellis and Chiang co-founded Sublime Systems to refine and scale up the electrochemical process they created for making cement.
Sublime has raised $50 million from some leading clean-tech investors, including Chris Sacca’s LowerCarbon Capital and Boston-based, MIT spin-out venture firm The Engine; from Siam Cement Group, a leading cement and building materials company in Asia; and via a couple of grants from the U.S. Department of Energy’s Advanced Research Projects Agency-Energy, or ARPA-E, program.
Leah Ellis, CEO of Sublime Systems
Photo courtesy Summer Camerlo, Sublime Systems
Ellis likes to describe what they’re doing as developing the “electric vehicle of cement making.” An electric vehicle replaces a combustion engine with an electric motor, and that’s what Sublime Systems does in the cement-making process.
“I think for the layperson, it’s easiest for them to understand how we take that high-temperature, fossil-driven process and replace it with something that is powered by electrons. And we’re using electrons to push these chemical reactions,” Ellis told CNBC by phone Wednesday. “That happens at an ambient temperature below the boiling point of water,” she said, and that is a critical differentiator.
Ellis said she didn’t know much about cement when Chiang bade her to go figure out how to make low-carbon cement. She started by reading Wikipedia, and then textbooks. Then she worked with another Ph.D. student doing research that was later published in scientific journal articles on the topic. That led to the concept for what Sublime is doing now, and she’s continued to refine that concept ever since.
“And basically just haven’t stopped,” Ellis told CNBC. “It’s been five years.”
Bringing the ‘magic’ of chemistry to cement
Ellis has always been curious. “I grew up pretty nerdy, I guess, reading a lot of books,” she said. “I always had that thirst for knowledge and a sense of adventure.”
She also grew up in a religious household. Her father is an Orthodox Jewish rabbi from Texas, her mother grew up on a sheep farm in South Africa, and the two met when they were both in Israel. “Jerusalem has more than enough rabbis. So he moved to eastern Canada, where they don’t have a lot of rabbis,” Ellis told CNBC of her father’s move. Her family celebrated and encouraged having a robust intellectual life.
Leah Ellis, CEO of Sublime Systems, works in the cement lab.
Photo courtesy Leah Ellis
Ellis and one of her two younger sisters ended up getting their doctorates in chemistry.
“Both of us realize that chemistry is a very creative subject; it’s also a very difficult subject. And I think we both sort of gravitate to things that are challenging,” Ellis told CNBC.
When mastered, chemistry can be used to effect change. “It has a lot of creative power to make things happen in the real world,” Ellis said. “It’s almost like magic. If you work really hard on it, you can create things that make the world a better place.”
Battery scientists and cement producers have not historically worked together. “Cement typically sits in civil engineering, and battery science normally sits in chemistry or physics,” Ellis said. “They don’t go to the same conferences.”
But with Sublime Systems, Ellis and Chiang are bringing those two fields together.
That framework of using electrochemistry to drive reactions that once happened with very hot fossil fuel-powered reactions is not exclusive to cement.
“It’s a huge tool. I don’t think Sublime is the only one that’s applying electrochemistry to clean tech. I think the best way we have to get around fossil fuels is to use electrons,” Ellis told CNBC.
“The electrochemical way is often more efficient,” she said. “Heating things up to make them go is often not as efficient as electrochemistry, which is a bit more surgical, a bit more efficient — or at least can be more efficient with the right processes.”
That fundamental energy efficiency is why Chiang is confident in their solution.
“Decarbonizing cement production is going to be a very tough task. There will be numerous approaches, all of which have challenges and most of which deserve to be tested,” Chiang told CNBC. “I prefer to face our challenges because we see a pathway to complete decarbonization at cost parity with today’s cement while consuming the least amount of energy. In the long run, the lowest-energy process usually wins.”
Yet-Ming Chiang, professor of materials science and engineering at Massachusetts Institute of Technology, speaks during the 2016 IHS CERAWeek conference in Houston, Texas, Feb. 26, 2016.
Bloomberg | Bloomberg | Getty Images
The cement industry needs to clean up shop
“On the whole, the industry is highly motivated to go green,” Mark Mutter, the founder of Jamcem Consulting, an independent cement industry consultancy, told CNBC. Motivations to go green are highest for producers located in parts of the world such as Europe, where there is a price on carbon dioxide emissions at around 80 euros (almost $88) per metric ton. That’s “a big financial penalty for producers and it gives them an incentive to invest” in green cement tech, Mutter told CNBC.
That’s one reason investors are putting money behind Sublime.
“Customers are lining up to partner with Sublime because they can supply fossil-free cement at a time when the rest of the industry are all struggling to hit emissions targets and comply with carbon tariffs,” Clay Dumas, partner at LowerCarbon Capital, told CNBC.
“For Lowercarbon, their omnipresence and medieval production techniques are precisely the qualities that make building materials such an irresistible opportunity,” Dumas told CNBC.
Some cement producers are looking at carbon capture technologies as a way to manage their greenhouse gas emissions. But “this is highly costly, and in some respects is just business as usual and burying the problem for future generations,” Mutter told CNBC.
Sublime is making clean cement without the expensive additive of carbon capture and storage technologies, which is attractive because it keeps costs low, said Katie Rae, CEO at The Engine. “Producing decarbonized cement directly, rather than doing carbon capture, drives both energy efficiency and eventual cost parity,” Rae told CNBC.
Dumas said Sublime has “the most elegant chemistry, which runs on electricity at ambient temperatures while emitting zero carbon. That means they have no need for big ovens or costly CO2-capture systems that would drive up capex.”
Siam Cement Group looks at thousands of companies and makes only “a few” investments a year, Tim McCaffery, a venture investor at SCG, told CNBC. For SCG, what’s attractive about Sublime is that it avoids the complicated and expensive carbon capture technology and works with existing infrastructure.
“We have seen that Sublime Systems could disrupt the industry. The company produces a cement at room temperature that can drop into the existing ready mix supply chain and meets American Society for Testing and Materials standards,” McCaffery told CNBC. American Society for Testing and Materials is the body that creates test standards and protocols that manufacturers use to test their materials against.
Climbing stairs, making solutions, moving forward
Sublime completed its pilot plant at the end of 2022 and spent a few months on quality control measures. Now, Ellis is focused on getting the product to partners, and the company hopes to do its first construction project by the end of the year. The next step is to go from the 100-ton pilot plant to a 30,000-ton-per-year demonstration plant.
While Sublime is just getting ramped up, Ellis knows speed is essential in the race to decarbonize. “My mission is to have a swift and massive impact on climate change,” she told CNBC in Boston.
Leah Ellis bikes in Africa.
Photo courtesy Scott Carmichael
It’s an audacious goal, and while Ellis has credentialed chemistry chops, this is her first time being the boss of a company.
“I suppose I am aware of my age. And I’m also humble about that. I’m a first-time founder. I’m a first-time CEO,” Ellis told CNBC. “I figure things out as I do them. And I’m really lucky to have great mentors and support and people who believe in me, and, I think, who recognize the fact that I have a lot of energy, and I have a lot of passion. And I’m going to work as hard as I can for as long as I can to make this happen.”
Ellis knows how to keep herself going, too. She makes sure she gets good sleep and she stays active. She’s run seven marathons. She’s a cycler, and once cycled across Africa in about four months with a group, a trip that averaged out to riding more than 60 miles a day. She also participates in a “fitness cult” that climbs the Harvard stadium stairs every Sunday.
“I’m not a fast runner at all. I’m not a fast cyclist either,” Ellis told CNBC. “I just know how to toe that effort line to just like maintain the same effort for a very long time, and to keep my own spirits up.”
For Chiang, building solutions keeps him moving forward.
“It’s been about 15 years since the words ‘climate change’ entered the lexicon. It’s been a gift, and very energizing, to have potentially impactful solutions to pursue, as opposed to sitting and fretting,” Chiang told CNBC.
“I believe climate change has pushed all of us into an extremely fertile, creative period that will be looked back on as a true renaissance. After all, we’re trying to re-invent the technological tools of the industrial revolution. There’s no shortage of great problems to work on! And time is short.”
Jakub Porzycki | Nurphoto | Getty Images
Mark Zuckerberg’s announcement this week that Meta would pivot its moderation policies to allow more “free expression” was widely viewed as the company’s latest effort to appease President-elect Donald Trump.
More than any of its Silicon Valley peers, Meta has taken numerous public steps to make amends with Trump since his election victory in November.
That follows a highly contentious four years between the two during Trump’s first term in office, which ended with Facebook — similar to other social media companies — banning Trump from its platform.
As recently as March, Trump was using his preferred nickname of “Zuckerschmuck” when talking about Meta’s CEO and declaring that Facebook was an “enemy of the people.”
With Meta now positioning itself to be a key player in artificial intelligence, Zuckerberg recognizes the need for White House support as his company builds data centers and pursues policies that will allow it to fulfill its lofty ambitions, according to people familiar with the company’s plans who asked not to be named because they weren’t authorized to speak on the matter.
“Even though Facebook is as powerful as it is, it still had to bend the knee to Trump,” said Brian Boland, a former Facebook vice president, who left the company in 2020.
Meta declined to comment for this article.
In Tuesday’s announcement, Zuckerberg said Meta will end third-party fact-checking, remove restrictions on topics such as immigration and gender identity and bring political content back to users’ feeds. Zuckerberg pitched the sweeping policy changes as key to stabilizing Meta’s content-moderation apparatus, which he said had “reached a point where it’s just too many mistakes and too much censorship.”
The policy change was the latest strategic shift Meta has taken to buddy up with Trump and Republicans since Election Day.
A day earlier, Meta announced that UFC CEO Dana White, a longtime Trump friend, is joining the company’s board.
And last week, Meta announced that it was replacing Nick Clegg, its president of global affairs, with Joel Kaplan, who had been the company’s policy vice president. Clegg previously had a career in British politics with the Liberal Democrats party, including as a deputy prime minister, while Kaplan was a White House deputy chief of staff under former President George W. Bush.
Kaplan, who joined Meta in 2011 when it was still known as Facebook, has longstanding ties to the Republican Party and once worked as a law clerk for the late conservative Supreme Court Justice Antonin Scalia. In December, Kaplan posted photos on Facebook of himself with Vice President-elect JD Vance and Trump during their visit to the New York Stock Exchange.
Joel Kaplan, Facebook’s vice president of global policy, on April 17, 2018.
Niall Carson | PA Images | Getty Images
Many Meta employees criticized the policy change internally, with some saying the company is absolving itself of its responsibility to create a safe platform. Current and former employees also expressed concern that marginalized communities could face more online abuse due to the new policy, which is set to take effect over the coming weeks.
Despite the backlash from employees, people familiar with the company’s thinking said Meta is more willing to make these kinds of moves after laying off 21,000 employees, or nearly a quarter of its workforce, in 2022 and 2023.
Those cuts affected much of Meta’s civic integrity and trust and safety teams. The civic integrity group was the closest thing the company had to a white-collar union, with members willing to push back against certain policy decisions, former employees said. Since the job cuts, Zuckerberg faces less friction when making broad policy changes, the people said.
Zuckerberg’s overtures to Trump began in the months leading up to the election.
Following the first assassination attempt on Trump in July, Zuckerberg called the photo of Trump raising his fist with blood running down his face “one of the most badass things I’ve ever seen in my life.”
A month later, Zuckerberg penned a letter to the House Judiciary Committee alleging that the Biden administration had pressured Meta’s teams to censor certain Covid-19 content.
“I believe the government pressure was wrong, and I regret that we were not more outspoken about it,” he wrote.
After Trump’s presidential victory, Zuckerberg joined several other technology executives who visited the president-elect’s Mar-a-Lago resort in Florida. Meta also donated $1 million to Trump’s inaugural fund.
On Friday, Meta revealed to its workforce in a memo obtained by CNBC that it intends to shutter several internal programs related to diversity and inclusion in its hiring process, representing another Trump-friendly move.
The previous day, some details of the company’s new relaxed content-moderation guidelines were published by the news site The Intercept, showing the kind of offensive rhetoric that Meta’s new policy would now allow, including statements such as “Migrants are no better than vomit” and “I bet Jorge’s the one who stole my backpack after track practice today. Immigrants are all thieves.”
Recalibrating for Trump
Zuckerberg, who has been dragged to Washington eight times to testify before congressional committees during the last two administrations, wants to be perceived as someone who can work with Trump and the Republican Party, people familiar with the matter said.
Though Meta’s content-policy updates caught many of its employees and fact-checking partners by surprise, a small group of executives were formulating the plans in the aftermath of the U.S. election results. By New Year’s Day, leadership began planning the public announcements of its policy change, the people said.
Meta typically undergoes major “recalibrations” after prominent U.S. elections, said Katie Harbath, a former Facebook policy director and CEO of tech consulting firm Anchor Change. When the country undergoes a change in power, Meta adjusts its policies to best suit its business and reputational needs based on the political landscape, Harbath said.
“In 2028, they’ll recalibrate again,” she said.
After the 2016 election and Trump’s first victory, for example, Zuckerberg toured the U.S. to meet people in states he hadn’t previously visited. He published a 6,000-word manifesto emphasizing the need for Facebook to build more community.
The social media company faced harsh criticism about fake news and Russian election interference on its platforms after the 2016 election.
Following the 2020 election, during the heart of the pandemic, Meta took a harder stand on Covid-19 content, with a policy executive saying in 2021 that the “amount of COVID-19 vaccine misinformation that violates our policies is too much by our standards.” Those efforts may have appeased the Biden administration, but it drew the ire of Republicans.
Meta is once again reacting to the moment, Harbath said.
“There wasn’t a business risk here in Silicon Valley to be more right-leaning,” Harbath said.
While Trump has offered few specific policy proposals for his second administration, Meta has plenty at stake.
The White House could create more relaxed AI regulations compared with those in the European Union, where Meta says harsh restrictions have resulted in the company not releasing some of its more advanced AI technologies. Meta, like other tech giants, also needs more massive data centers and cutting-edge computer chips to help train and run their advanced AI models.
“There’s a business benefit to having Republicans win, because they are traditionally less regulatory,” Harbath said.
Meta’s CEO Mark Zuckerberg reacts as he testifies during the Senate Judiciary Committee hearing on online child sexual exploitation at the U.S. Capitol in Washington, U.S., January 31, 2024.
Evelyn Hockstein | Reuters
Meta isn’t alone in trying to cozy up to Trump. But the extreme measures the company is taking reflects a particular level of animus expressed by Trump over the years.
Trump has accused Meta of censorship and has expressed resentment over the company’s two-year suspension of his Facebook and Instagram accounts following the Jan. 6 attack on the Capitol.
In July 2024, Trump posted on Truth Social that he intended to “pursue Election Fraudsters at levels never seen before, and they will be sent to prison for long periods of time,” adding “ZUCKERBUCKS, be careful!” Trump reiterated that statement in his book, “Save America,” writing that Zuckerberg plotted against him during the 2020 election and that the Meta CEO would “spend the rest of his life in prison” if it happened again.
Meta spends $14 million annually on providing personal security for Zuckerberg and his family, according to the company’s 2024 proxy statement. As part of that security, the company analyzes any threats or perceived threats against its CEO, according to a person familiar with the matter. Those threats are cataloged, analyzed and dissected by Meta’s multitude of security teams.
After Trump’s comments, Meta’s security teams analyzed how Trump could weaponize the Justice Department and the country’s intelligence agencies against Zuckerberg and what it would cost the company to defend its CEO against a sitting president, said the person, who asked not to be named because of confidentiality.
Meta’s efforts to appease the incoming president bring their own risks.
After Zuckerberg announced the new speech policy Tuesday, Boland, the former executive, was among a number of users who took to Meta’s Threads service to tell their followers that they were quitting Facebook.
“Last post before deleting,” Boland wrote in his post.
Before the post could be seen by any of his Threads followers, Meta’s content moderation system had taken it down, citing cybersecurity reasons.
Boland told CNBC in an interview that he couldn’t help but chuckle at the situation.
“It’s deeply ironic,” Boland said.
— CNBC’s Salvador Rodriguez contributed to this report.
WATCH: Meta is returning to free speech tradition, says Facebook’s former chief privacy officer Chris Kelly
Jaap Arriens | Nurphoto | Getty Images
Apple is losing market share in China due to declining iPhone shipments, supply chain analyst Ming-Chi Kuo wrote in a report on Friday. The stock slid 2.4%.
“Apple has adopted a cautious stance when discussing 2025 iPhone production plans with key suppliers,” Kuo, an analyst at TF Securities, wrote in the post. He added that despite the expected launch of the new iPhone SE 4, shipments are expected to decline 6% year over year for the first half of 2025.
Kuo expects Apple’s market share to continue to slide, as two of the coming iPhones are so thin that they likely will only support eSIM, which the Chinese market currently does not promote.
“These two models could face shipping momentum challenges unless their design is modified,” he wrote.
Kuo wrote that in December, overall smartphone shipments in China were flat from a year earlier, but iPhone shipments dropped 10% to 12%.
There is also “no evidence” that Apple Intelligence, the company’s on-device artificial intelligence offering, is driving hardware upgrades or services revenue, according to Kuo. He wrote that the feature “has not boosted iPhone replacement demand,” according to a supply chain survey he conducted, and added that in his view, the feature’s appeal “has significantly declined compared to cloud-based AI services, which have advanced rapidly in subsequent months.”
Apple’s estimated iPhone shipments total about 220 million units for 2024 and between about 220 million and 225 million for this year, Kuo wrote. That is “below the market consensus of 240 million or more,” he wrote.
Apple did not immediately respond to CNBC’s request for comment.
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