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TED Tech

TED Tech

A concrete plan for sustainable cement | Ryan Gilliam

TED Tech · Aug 29, 2025 · 10:43

0:0010:43

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Cement is one of the most-consumed materials on Earth — second only to water — and it accounts for a whopping eight percent of the world's carbon pollution. What if we could turn this climate villain into a hero? Clean tech innovator and serial entrepreneur Ryan Gilliam reveals his company's surprisingly simple process for transforming waste from the cement-making process back into limestone using existing infrastructure, creating a competitive and eco-friendly product that could pave the way for gigaton-scale climate solutions.


After the talk, Sherrell reflects on the market for green cement and highlights other initiatives working to increase transparency and adopt lower-emission products.


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