Celebrating Puro’s ERW 2025 Update
Today marks a major milestone in the journey toward scalable, credible carbon removal: Puro.earth has published its much-anticipated 2025 update to the Enhanced Rock Weathering (ERW) methodology. We at Oceanid Climate and Carbon Solutions are proud to have played a contributing role.
The new ERW standard reflects an evolving science and the maturing needs of the carbon removal market. In the updated methodology, Puro.earth introduced enhanced quantification approaches, detailed sampling protocols, and improved accounting for loss terms, including soil chemistry, mineral formation, adsorption, plant losses, and hydrologic transport, as well as rigorous uncertainty management.
The update did not come lightly: the process involved constant engagement from our outstanding, expert working group, interviews with stakeholders from academia, industry, and non-profits, and a transparent public consultation that elicited 144 comments leading to 91 minor and 4 major revisions.
For carbon removal project developers, this update dramatically raises the bar for scientific rigor, transparency, and accountability. By requiring dual methods for CO₂ quantification and verification, and embedding robust statistical treatment of uncertainty, the new standard strengthens confidence in ERW as a mature, credible CDR pathway.
At Oceanid, our commitment to rigorous marine and terrestrial carbon removal solutions aligns deeply with Puro’s updated ERW methodology. Our experience in CDR standards development and ecosystem-informed project design brings valuable insights - from soil and ocean chemistry to ecological integrity - helping ensure that carbon removal delivers real climate impact.
Puro’s 2025 ERW update isn’t just a technical refinement - it’s a landmark moment in the CDR landscape. It signals that enhanced rock weathering is moving from theory and pilot-stage toward robust, scalable deployment. We celebrate this milestone and look forward to partnering with Puro.earth and the broader CDR community to turn this science into real, lasting climate impact.
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Download the standard: