March 25, 2025
Eion offers farmers a cheaper alternative to lime for managing soil pH.
Olivine-based deployments can help accelerate the scale-up of enhanced rock weathering more broadly.
Frontier has facilitated offtakes with Eion, a carbon removal company deploying enhanced weathering in the Southern and Midwestern regions of the United States. Frontier buyers will pay $33 million to remove 78,707 tons of CO₂ between 2027 and 2030.
Today, Eion sources olivine, a rock type that reacts quickly with CO₂, spreads it on agricultural fields, and measures how much CO₂ is removed. The olivine reacts with rainwater, converting atmospheric CO₂ into bicarbonate, which is stored permanently in the ocean. Olivine has two main advantages: 1) it weathers fast, which means it can remove CO₂ faster than other enhanced weathering methods, and 2) it’s a substitute for ag lime, a commonly used product to manage soil acidity. Olivine can be applied using existing agricultural practices and ends up costing farmers less because Eion sells carbon removal credits that subsidize the price.
The case for Eion
Olivine’s benefit to farmers is straightforward and compelling. Eion’s product is a comparable substitute to ag lime, making it an easy sell to farmers—especially in regions with acidic soils. Thanks to the revenue generated by selling carbon removal, farmers can afford Eion’s product even when ag lime is prohibitively expensive or difficult to source.
Eion is building agricultural partnerships to reach more farmers faster. Unlike other companies that handle logistics, spreading, and sampling with their own staff, Eion instead partners with crop advisors at large agricultural distributors including Growmark and Southern Ag. These partnerships allow Eion to tap into existing expertise and scale efficiently.
Olivine-based deployment can help accelerate the scale-up of enhanced rock weathering across feedstock types. While olivine-based weathering is unlikely to reach gigaton scale with existing mining volumes, it can help pave the way for the accelerated deployment of enhanced rock weathering with other more abundant feedstocks like basalt. This is in part due to the fact that olivine weathers significantly faster than basalt, which translates to faster data collection, iteration, and learning. It’s also in part because the farmer relationships built through Eion’s trusted partnership will ideally pave the way for the deployment of other feedstocks.
Eion’s MRV approach includes an important research component—deep soil sampling—that will shed light on long-standing scientific questions in enhanced weathering. Eion is collecting deep soil measurements to understand how atoms in dissolving rocks interact with water and soil particles on their journey through the soil column. This work will uncover when soil-rock interactions affect the rate or magnitude of carbon removal that can occur in the soil. Cascade Climate identified this as a priority area for enhanced weathering and no other company is currently doing this type of research.
Frontier has facilitated purchases on behalf of Frontier Founding Members Stripe, Google, and Shopify, as well as Autodesk, H&M Group, JPMorgan Chase, Workday, and Salesforce. Also, Aledade, Canva, Match Group, Samsara, SKIMS, Skyscanner, Wise, and Zendesk have purchased via Watershed’s partnership with Frontier.
Anastasia Pavlovic, CEO, Eion: “Frontier’s offtake greatly accelerates our ability to impact more farmers and landowners, expand our scientific validation efforts, and drive down the cost of durable carbon removal through enhanced rock weathering of olivine. It will enable us to turn a promising pathway into real, measurable impact grounded in rural communities, guided by science, and aimed at unlocking gigatons of carbon removal.”
Hannah Bebbington, Head of Deployment at Frontier: “Eion has two big advantages: olivine weathers fast and farmers can adopt it easily. This means they’ll deliver more carbon removal and more weathering data that can move the entire enhanced weathering field forward.”