Lithos accelerates the natural ability of rocks to absorb CO₂ by spreading superfine crushed basalt on farmlands and measuring the removal empirically. They source the finely ground basalt from existing quarries who produce it in large quantities as a waste by-product. They then transport this basalt to farmers, who use it as an alternative to existing, often costly inputs for soil deacidification.
The basalt rock reacts with rainwater and locks up atmospheric CO₂ as bicarbonate, which ultimately makes its way to the ocean for permanent storage. Lithos measures the dissolution of the rock over time in soil samples using mass spectrometers to quantify the carbon removed.