Permanent Carbon Removal
Better Gravel Roads
Alkali Earth uses highly reactive minerals in steel slag to permanently remove CO₂ through carbon mineralization in gravel roads.
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.
PARTNERS
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Carbon Credit Buyers
We are offering high-quality, permanent carbon credits for delivery starting in 2025. Reach out to learn more about volumes and delivery timelines.
Aggregate Buyers
In addition to gravel roads and parking lots, we are also exploring novel use cases for slag, including deployment around the battery, wind, and solar farms. If you want to upgrade your existing aggregates to capture CO₂, call us.
Investors
We are just getting started and looking to grow with the right partners. If you’re interested in investment options, please reach out.
Job Seekers
Are you motivated and ready to make an impact on carbon removal? We are beginning to grow our team, including roles across our science team, business development, and operations.