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Published on September 30, 2022

Enhanced Rock Weathering in Soil Methodology

We at Puro.earth are delighted to launch the world's first Enhanced Rock Weathering (ERW) methodology!

Enhanced rock weathering (ERW) is a process that aims to accelerate natural rock weathering during which carbon dioxide reacts with rocks, a process that usually takes thousands of years. Silicate weathering begins with the reaction between water, carbon dioxide and silicate rocks which breaks down the rock. CO2 is removed from the atmosphere and converted to bicarbonates and/or carbonates. As a carbon removal method, ERW involves finely grinding down silicate rocks to increase their surface area and spreading them over soil, resulting in the long-term storage of large amounts of carbon dioxide, for likely thousands of years.

Enhanced rock weathering has been considered for almost 30 years to remove atmospheric carbon dioxide as it has significant CO₂ removal potential at a global scale, yet it is not included in any existing carbon crediting program. Today, Puro.earth is proud to present the first ERW carbon crediting methodology.  

We brought together a working group made up of scientific and carbon market experts, supported by Puro.earth’s Advisory Board who oversees Puro Standard's carbon removal methodologies to ensure high carbon credit integrity and robust principles for a science-based carbon removal standard.

The working group has defined safeguards and quantification approaches aligned with the latest science. This methodology ensures little to no environmental impact, which is critical to increasing public acceptance of ERW. It sets strict thresholds for contaminant levels of the ground rock in accordance with the EU regulation for inorganic soil improvers and require projects to perform laboratory tests of soil samples to establish baselines. In acidic conditions, ERW has the co-benefit of restoring nutrient depleted soils.

With these safeguards in place, we believe ERW projects can be designed and implemented safely, accruing data that will in time improve this methodology.

Download the methodology here

Watch the methodology presentation of the working group:


The consultation period has closed and we are ready to receive project applications.

If you are a project developer or potential supplier of Enhanced Rock Weathering in Soil carbon removal, please contact us.

If you are interested in buying CORCs from a Enhanced Rock Weathering in Soil project, get started here


Are you ready to include carbon removal in your climate actions? Welcome to learn more about carbon removal suppliers at Puro.earth and don't hesitate to contact us. 

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