In late October, Rio Tinto announced plans to capture and bury CO2 from its ISAL aluminum smelter outside Reykjavik in the basalt right under its feet. The initiative is part of a $7.5bn effort to reduce firm-wide operational emissions by 50% by 2030. Today, Switched On speaks with Kari Helgason, head of research and innovation at Carbfix, the company that will take Rio's CO2 and inject it underground where it will turn to rock within two years. In our conversation, which takes place on location in Iceland at the site of Carbfix's first CO2 injection project, he tells us how the technology works, and how Carbfix's solution could scale to make a meaningful dent in global emissions.

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Switched on this week is hosted by Mark Taylor.

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