Concept methodology Enhanced Rock Weathering

Over the past six months, the Carbon Neutral Initiative has participated in a working group with various experts based on enhanced weathering. This resulted in a concept methodology being presented by Puro.earth on Wednesday 20 September. This is as a huge step for the entire CDR industry.

Public Consultation of Enhanced Rock Weathering in Soil Methodology

We at Puro.earth are delighted to invite you to give your comments on a world leading Enhanced Rock Weathering (ERW) methodology!

The consultation period will remain open until 17.10.2022, end of business day.

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 for public consultation.

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 draft here

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