Eion, a company specialising in enhanced rock weathering (ERW), has announced a $33 million carbon removal agreement with Frontier buyers, marking its largest contract to date. Under the agreement, Eion will remove 78,707 tonnes of carbon dioxide between 2027 and 2030 by spreading olivine, a fast-weathering mineral, across farmland in the US Midwest and South.
To facilitate large-scale implementation, Eion has partnered with Growmark, one of North America’s major agricultural cooperatives. Growmark’s farmer network, which reaches nearly 400,000 customers, will enable broader deployment of ERW across new regions.
Enhanced rock weathering accelerates the natural breakdown of minerals that absorb CO2 from the atmosphere—a process that typically takes thousands of years—into a timeframe of just several years. Eion uses olivine, which has been approved for agricultural use for decades, due to its high carbon absorption capacity and suitability for integration with existing farming practices. Farmers can use the mineral as a substitute for agricultural lime.
Eion’s CEO, Anastasia Pavlovic, said the deal with Frontier provides an opportunity to significantly scale ERW in the United States. “Through our partnership with Growmark, we aim to integrate carbon removal with existing agricultural operations,” she said.
Growmark Executive Vice President Brad Drake said, “We see value in supporting products that connect farmers with carbon markets while contributing to sustainable agricultural practices.”
Eion claims its carbon removal process is grounded in direct measurement using soil sampling and standard laboratory methods. Each sample is analysed for trace elements, including nickel and chromium, and benchmarked against safety thresholds informed by US Environmental Protection Agency (EPA) data.
Frontier facilitated this carbon removal purchase on behalf of its founding members—Stripe, Google, Shopify, and McKinsey Sustainability—as well as companies including Autodesk, H&M Group, Workday, Salesforce, and others.
