Enhanced Rock Weathering (ERW) with Basalt

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Future Tech

Curated by Surfaced Editorial·Climate·2 min read

Enhanced Rock Weathering (ERW) accelerates natural geological processes by spreading finely ground silicate rocks, such as basalt, onto agricultural land or coastlines. When these minerals react with atmospheric CO2 and rainwater, they form bicarbonates that eventually flow into oceans, permanently locking away carbon. Projects like the UK's Leverhulme Centre for Climate Change Mitigation and organizations like CarbonBuilt are actively researching and piloting ERW. The technology is in advanced research and early field trials, with multiple large-scale agricultural experiments underway globally; a 2022 study published in Nature Geoscience demonstrated that basalt application on farmland in the US Midwest removed 6.4 to 9.6 tons of CO2 per hectare per year. This method enhances a natural carbon sink, contrasting with industrial capture methods that require engineered facilities.

Why It Matters

ERW offers a scalable solution to capture atmospheric CO2, potentially mitigating climate change impacts on agriculture and food security for billions. Imagine vast croplands where farmers actively contribute to carbon removal, leading to improved soil health, increased crop yields, and a stable climate. Farmers and mineral processing companies stand to gain, while industries resistant to decarbonization might face new market pressures. The primary barriers are the energy intensity of grinding vast quantities of rock, the logistics of transport, and ensuring minimal environmental side effects on soil chemistry. Widespread adoption is anticipated by 2035-2045, with significant research and investment from countries like the UK, US, and Australia. A subtle consequence could be a shift in global agricultural trade dynamics, as regions with abundant basalt reserves gain a new economic advantage.

Development Stage

Early Research

Advanced Research

Prototype

Early Commercialization

Growth Phase

f in r/✉

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