Four thousand one hundred feet beneath the Black Hills of South Dakota, in a converted gold mine that has become one of the world's most unusual laboratories, Dr. Tanvi Govil discovered something that could help heal the planet—and she found it living in the rocks.
The microbes Govil's team uncovered at the Sanford Underground Research Facility are nature's climate engineers. These extremophile organisms, evolved to survive in the scorching, acidic, high-pressure environment deep underground, do something remarkable: they eat carbon dioxide and convert it into solid rock in just a few weeks. For decades, scientists have known microbes could theoretically scrub CO₂ from emissions, but they kept failing under the harsh conditions of real industrial exhaust. Power plant flue gases are, as Merle Symes, CEO of Govil's startup Carb-N0, bluntly puts it, "pretty nasty." The microbes from SURF are different. They don't just survive the heat, pressure, and acidity—they thrive on it.
The efficiency gains are staggering. Traditional carbon capture can take years to sequester CO₂ underground. Govil's microbes do it in weeks, a speed-up that transforms carbon capture from an abstract scientific exercise into something commercially viable. Her team, funded by the National Science Foundation, realized they could skip the expensive step of piping CO₂ deep underground altogether. Instead, these enzymes could sit right at the smokestack, directly removing greenhouse gas from power plant emissions on site, then converting that captured carbon into calcium carbonate—a mineral with immediate market value as a concrete additive.
The concept is elegant in its simplicity: bubble flue gas through a tank of enzyme solution, watch the CO₂ convert into a sellable product, and remove the emissions from the exhaust stream in real time. Govil's team has already tested the approach with actual emissions samples from local industries, including real coal-plant flue gases and leftover coal ash, proving the concept works at laboratory scale.
The business opportunity is immense. The global carbon capture market is valued at $4.51 billion in 2025 and is projected to reach $19.98 billion by 2034. Humanity currently emits more than 37 billion metric tons of CO₂ per year—a challenge so enormous that even breakthrough technologies feel urgent. Yet Govil and Symes, who recently won South Dakota's Governor's Giant Vision Business Plan competition, are moving with impressive speed. They're planning to build a mobile, truck-bed-sized enzyme scrubber capable of capturing almost one ton of CO₂ per day, which they'll deploy to different facilities for pilot testing. If those tests succeed this year, enzyme production could launch by 2027, with commercial deployment potentially beginning by next year.
"There's some urgency in this, given the importance of what this technology could mean for humanity," Symes said. What began as a sample collected from a former gold mine's deepest chambers could soon become a tool deployed at industrial facilities around the world—a small but tangible way that life deep within the Earth might help us reckon with what we've released into the sky.