Recycling industrial minerals
for permanent carbon removal
Alkali Earth uses industrial minerals like steel slag to permanently remove CO₂ through enhanced mineralization.
Alkali Earth + Steel Slag = Permanent Carbon Removal
Simple
We convert atmospheric CO₂ into carbonate minerals using highly reactive minerals in steel slag that we crush and mix into different types of aggregate products. After we deploy our aggregates, they begin to react passively and remove CO₂ without additional energy inputs.
Low Cost
We use an industrial byproduct to capture carbon while building better gravel roads. Because we work with an established industrial partner, we can deliver CO₂ capture at industry-leading costs.
Scalable
Our process leverages existing industrial infrastructure, which already moves gigatons of aggregate material globally. We divert steel slag from landfills, putting them to work for carbon removal, allowing us to scale our impact rapidly.
Permanent
Carbonate minerals produced in our aggregate layers represent a thermodynamically stable form of carbon removal that keeps carbon out of the atmosphere for thousands to millions of years.
Measurable
Measurement, reporting, and verification (MRV) are core to what we do. We use simple measurements to directly quantify carbon removal in all of our projects.
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