In March 2025, Eion, a startup specializing in enhanced rock weathering (ERW), announced a $33 million carbon removal offtake agreement with Frontier, a consortium backed by companies like McKinsey, Alphabet, Meta, Shopify, and Stripe. Under this deal, Eion will remove 78,707 tons of CO₂ between 2027 and 2030 by applying crushed olivine—a mineral optimized for rapid weathering—across farmlands in the U.S. Midwest and South. This process not only sequesters carbon but also improves soil health by increasing pH levels. To facilitate large-scale deployment, Eion has partnered with agricultural cooperative Growmark, which serves nearly 400,000 farmers, providing a seamless integration of this technology into existing farming practices.

Eion’s approach replaces traditional agricultural lime with olivine, offering farmers a cost-effective alternative that also contributes to carbon sequestration. The company employs a patented “soil fingerprinting” technique to measure CO₂ removal, analyzing trace elements like magnesium and nickel to quantify the weathering process. Revenue from carbon credits—priced around $420 per ton in this deal—is shared with participating farmers, subsidizing their soil amendment costs by 40–60%.