# Building the Future Without Breaking the Climate | Leah Ellis | TEDxBoston Source: https://www.youtube.com/watch?v=m94-O3GmV0s Recap page: https://rapidrecap.app/video/m94-O3GmV0s Generated: 2026-01-21T17:15:12.614+00:00 --- ## Quick Overview Leah Ellis, co-founder of Sublime Systems, discusses their mission to create high-performance, low-carbon cement that meets modern standards, highlighting that cement production accounts for 8% of global CO2 emissions and explaining how their technology aims to decarbonize this essential building material. **Key Points:** - Leah Ellis is the co-founder of Sublime Systems, an MIT spin-out company focused on developing technology to decarbonize and reinvent cement making. - Cement production is responsible for 8% of global CO2 emissions, making it one of the most massively produced man-made materials. - Sublime Systems' technology produces cement that is just as performant and cheap as necessary for the modern world while avoiding CO2 emissions. - The company has deployed its technology in pilot stages at several locations, including Boston Seaport and most recently in data centers, having collected hundreds of thousands of tons of offtake. - Ellis mentioned partnering with Microsoft, a major data center producer, and other hyperscalers who have aggressive commitments to low-carbon solutions. - Ellis, whose PhD was in chemistry focusing on batteries (working with Tesla), was drawn to the problem because of the sheer scale of cement's environmental impact and the lack of innovation in the industry for centuries. - The company is now working to scale its technology from pilot stages to full commercial scale. ![Screenshot at 00:25: Leah Ellis, co-founder of Sublime Systems, explains that their company's model is the 'gold standard' for producing cement while avoiding CO2 emissions.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-00-25.jpg) **Context:** This segment features an interview or panel discussion at TEDxBoston, where Leah Ellis, co-founder of Sublime Systems, is interviewed about her company's work in creating low-carbon cement. The discussion centers on the environmental impact of traditional cement manufacturing and how Sublime Systems' novel technology provides a sustainable alternative that maintains performance and cost-effectiveness. ## Detailed Analysis Leah Ellis, co-founder of Sublime Systems, an MIT spin-out, details the necessity of reinventing cement production due to its massive environmental impact, noting that cement contributes 8% of global CO2 emissions. Sublime Systems aims to set a new 'gold standard' by creating cement that performs as required by modern infrastructure while avoiding these emissions. Ellis shared that the company has successfully deployed its technology through pilot stages at various sites, including Boston Seaport and data centers, accumulating significant offtake. They have partnered with major hyperscalers like Microsoft, who are actively seeking low-carbon supply chains. Ellis, whose background is in chemistry and battery science (having worked with Tesla), was attracted to the problem because of its scale and the industry's historical lack of innovation. She emphasized that the industry has relied on the same processes for thousands of years, often ignoring the massive carbon footprint. Ellis expressed excitement about pushing the boundaries of human knowledge in this area and mentioned the challenge of scaling the technology from pilot projects to full commercial deployment, noting that the transition often follows an S-curve of innovation adoption. ### Company Origin and Mission - Sublime Systems, an MIT spin-out, aims to decarbonize and reinvent cement making - Cement is one of the most massively produced materials, responsible for 8% of global CO2 emissions - The goal is cement that is high-performing, cheap, and low-carbon. ### Technological Deployment and Partnerships - Pilots deployed at Boston Seaport and data centers, collecting hundreds of thousands of tons of offtake - Partnered with Microsoft and other hyperscalers committed to low-carbon solutions - Scaling from pilot stage to full scale is the current focus. ### Personal Background and Motivation - Ellis's PhD was in chemistry focusing on batteries, including work with Tesla - Drawn to cement due to the massive environmental impact and the industry's stagnation over millennia - Finding the pursuit of truth and goodness in this fundamental industry inspiring. ### Industry Context - Traditional cement production has remained largely unchanged for thousands of years, relying on processes that generate significant CO2 - Ellis noted that electricity generation's carbon footprint is common knowledge, unlike cement's high impact. ![Screenshot at 00:00: Introductory title card for "Ideas in Action Presents" at TEDxBoston.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-00-00.jpg) ![Screenshot at 00:04: Leah Ellis is introduced on stage next to a male interviewer, both sitting against a black backdrop.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-00-04.jpg) ![Screenshot at 00:58: Leah Ellis explains that Sublime Systems is an MIT spin-out developing technology to decarbonize cement manufacturing.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-00-58.jpg) ![Screenshot at 02:44: The interviewer asks about negotiations with Microsoft and whether the company is exclusive.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-02-44.jpg) ![Screenshot at 09:04: The interviewer asks Leah Ellis for her prediction for the next 50 to 250 years regarding leadership and innovation.](https://ss.rapidrecap.app/screens/m94-O3GmV0s/00-09-04.jpg)