Engineered Bacteria Supercharge Rock Weathering to Pull Carbon from the Sky

Scientists have engineered common soil bacteria to pump out far greater quantities of natural rock-dissolving compounds, a breakthrough that could dramatically accelerate the weathering of silicate minerals and turn an ancient geological process into a scalable tool for removing carbon dioxide from the atmosphere. The research, published in Nature Biotechnology, demonstrates that deliberately boosting the production of siderophores—iron-chelating molecules that bacteria normally use to scavenge scarce nutrients—can markedly speed up the chemical breakdown of basalt and other reactive rocks that lock away atmospheric carbon as they dissolve.

Enhanced rock weathering has long been touted as one of the most promising carbon removal strategies because it leverages a process that has regulated Earth’s climate for billions of years. When rainwater, slightly acidified by dissolved carbon dioxide, percolates through silicate rocks such as basalt, the carbonic acid pulls calcium and magnesium ions out of the mineral lattice. These ions ultimately combine with carbonate in oceans and soils, forming stable minerals that sequester carbon for tens of thousands of years or longer. The catch is speed: natural weathering operates on geological timescales, and even crushed and spread basalt can take years to decades to absorb a meaningful fraction of the carbon dioxide applied to farmland alongside it.

The new study attacks that bottleneck at its chemical root. Siderophores are small organic molecules with an extraordinary affinity for iron, capable of prizing the metal out of mineral surfaces even at vanishingly low concentrations. In doing so, they destabilize the crystal structures of iron-bearing silicates, exposing fresh surfaces to attack by carbonic and organic acids. Microbiologists have understood this mechanism for decades, but the idea of engineering microbes to produce siderophores at industrial scale for climate purposes remained largely theoretical—until now.

The research team used synthetic biology tools to upregulate the biosynthetic gene clusters responsible for siderophore synthesis in their bacterial strain, carefully balancing the metabolic burden that enhanced production imposes on the cells. Overproducing secondary metabolites can cripple microbial growth, so the engineering had to thread a needle between maximizing output and keeping the organisms viable. The resulting strains secreted siderophore concentrations several times higher than wild-type counterparts, and when applied to crushed basalt in controlled experiments, the treated microbial communities accelerated mineral dissolution rates well beyond what natural weathering achieves.

Measurements of dissolved ions released from the rock confirmed that the engineered bacteria were genuinely driving enhanced weathering rather than simply growing more prolifically. Elevated concentrations of calcium, magnesium, and silicon in solution served as chemical fingerprints of accelerated mineral breakdown. The researchers also tracked the fate of the released cations, which are the direct precursors of the carbonate species that permanently store carbon dioxide, providing a quantitative link between microbial activity and the theoretical carbon removal potential of the system.

What makes the approach especially attractive is its compatibility with existing agricultural practice. Enhanced rock weathering proposals typically involve spreading crushed basalt—a byproduct of mining and quarrying industries—across croplands, where it can also supply nutrients and raise soil pH. Adding engineered bacteria or their siderophore products to this workflow requires no new land, no exotic infrastructure, and no dramatic change in farm operations. The biological catalyst simply boosts the yield of carbon removal per tonne of rock applied, improving the economics of a scheme whose costs have otherwise been dominated by the grinding and transport of stone.

The carbon math is compelling if the laboratory results translate to the field. A single tonne of basalt can, in principle, absorb on the order of hundreds of kilograms of carbon dioxide over its weathering lifetime. If microbial siderophores can compress that timeline or increase the fraction of rock that fully dissolves, the effective carbon removal capacity of each tonne of applied rock rises accordingly, and with it the viability of gigatonne-scale deployment scenarios that climate models suggest will be necessary alongside deep emissions cuts.

Significant hurdles remain before engineered weathering microbes see real-world deployment. Field soils are wildly heterogeneous environments where introduced strains face competition from established microbial communities, predation, and fluctuating moisture and temperature. Regulators will also demand rigorous assessment of any genetically modified organism released into open agricultural systems, and researchers will need containment strategies or self-limiting designs to address ecological concerns. The team acknowledges that scaling from petri dishes and reactor columns to windswept fields is the defining test ahead.

Still, the study marks a striking convergence of biotechnology and geoscience, suggesting that the tools of synthetic biology can be pointed not merely at medicines and materials but at the planet’s own climate-regulating chemistry. If follow-up field trials vindicate the laboratory findings, the humble bacterial molecules that microbes have used for eons to feed on rock-bound iron could become one of the cheapest levers available for scrubbing carbon dioxide from the sky—and a vivid reminder that some of the most powerful climate technologies may already be alive in the soil beneath our feet.

Subject of Research: Engineered bacterial siderophore production for enhanced silicate rock weathering and carbon dioxide removal

Article Title: Engineered bacterial siderophore production accelerates rock weathering for carbon removal

Article References: Dalvie, N. C., Jalihal, A. P., Fitzgibbon, A., Böhnke, J.-T., Hijaz, M., Justman, Q. A., Davis, S. J., Silver, P. A., & Springer, M. (2026). Engineered bacterial siderophore production accelerates rock weathering for carbon removal. Nature Biotechnology. https://doi.org/10.1038/s41587-026-03288-w

Image Credits: AI Generated

DOI: 10.1038/s41587-026-03288-w

Keywords: enhanced rock weathering, siderophores, carbon removal, synthetic biology, basalt, silicate minerals, carbon dioxide sequestration, soil microbiology, climate engineering, mineral dissolution, biogeochemistry, Nature Biotechnology