In June last year, startup Octavia Carbon began running a high-stakes test in the small town of Gilgil in south-central Kenya. It’s harnessing some of the excess energy generated by vast clouds of steam under the Earth’s surface to power prototypes of a machine that promises to remove carbon dioxide from the air in a manner that the company says is efficient, affordable, and—crucially—scalable.
The company’s long-term vision is undoubtedly ambitious—it wants to prove that direct air capture…

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