What’s Your Problem? The High-Stakes Quest to Reinvent Cement

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Cement is, almost literally, everywhere. It is extraordinarily useful, which is why humanity makes 4 billion metric tons of it every year. But cement is also extremely carbon intensive to produce. Leah Ellis is the co-founder and CEO of Sublime Systems. Her problem is this: How can you make cement, at scale, without emitting carbon dioxide?

The Host

Jacob Goldstein

Jacob Goldstein spent more than a decade as co-host of the Planet Money podcast. He's also the author of the book Money: The True Story of a Made-Up Thing, which the New…