InPlanet has signed an agreement with Microsoft to remove more than 28,500 tonnes of carbon dioxide between 2026 and 2028 through enhanced rock weathering (ERW) projects in Brazil.
Enhanced rock weathering involves applying finely crushed silicate rock to agricultural soils, a process that captures atmospheric CO₂ while altering soil chemistry. The approach has gained attention as a potential carbon removal pathway that can be integrated into farming systems, particularly in tropical regions where weathering rates are higher.
According to InPlanet, field deployments over the past two years have shown changes in soil properties, including higher soil fertility, reduced fertiliser use and lower demand for agricultural limestone. The company said these outcomes suggest ERW can deliver both agronomic effects and long-term carbon removal.
“As part of this agreement with Microsoft, we can deepen our scientific research and further validate Enhanced Rock Weathering under real-world conditions,” said Felix Harteneck, Founder and CEO of InPlanet. “Our team is monitoring every aspect, from soil chemistry to local water systems, to ensure each tonne of CO₂ is rigorously accounted for. The insights we gain from these deployments will improve our measurement and verification methods, setting an even higher bar for transparency in carbon removal. Ultimately, this is about building trust: we want every stakeholder to know that each credit we deliver is grounded in solid science and delivers permanent climate benefits.”
InPlanet said it currently operates ERW projects across more than 12,000 hectares of farmland in Brazil. The company added that Brazil’s tropical climate enables faster silicate weathering than in many temperate regions, affecting the potential scale and pace of carbon removal.
All credits delivered under the agreement will be issued under Isometric’s Enhanced Weathering Protocol and listed on the Isometric Registry. Anonymised project data will also be shared via Cascade Climate’s ERW Data Quarry, the companies said.
“InPlanet’s commitment to measurement and monitoring bolster the integrity of their enhanced rock weathering carbon removal credits, which will contribute to Microsoft’s goal to be carbon negative by 2030,” said Phillip Goodman, Director, Carbon Removal Portfolio. “Their project illustrates how applying silicate rock to soils can offer benefits for farmers by improving soil health and supporting productivity. Enhanced rock weathering is a promising pathway to high-impact carbon removal, and we are encouraged by its potential to contribute to durable, positive climate outcomes.”
Microsoft said the purchase of ERW credits supports agricultural projects in Brazil while contributing to its broader carbon removal portfolio.
