A look back at the major milestones that defined mCDR in 2025—from first verified ocean-based carbon dioxide removal credits to new permits, protocols, and growing policy momentum.

Our first explainer video breaking down the essential chemistry behind ocean-based carbon dioxide removal (CDR) methods, part of a broader effort to support informed community dialogue around marine CDR.

Our latest technical demo highlights ROMS-Tools, a Python package that provides user-friendly tools to design new regional grids for ROMS-MARBL and streamlines the creation of the input files necessary to run a UCLA ROMS simulation.

To build trust in mCDR, the calculations that underpin carbon crediting need to be transparent and reproducible. This piece introduces the C-Star Blueprint: a new tool that makes ocean models auditable.

The Ocean Alkalinity Enhancement (OAE) Efficiency Map and the Direct Ocean Removal (DOR) Efficiency Map—developed by [C]Worthy and CarbonPlan—reveal when and where ocean-based carbon removal could be most effective. Our latest technical demo explains OAE and DOR, the motivation behind these tools, and how they support more credible and strategic deployments.

[C]Worthy and Third Derivative have released a practical roadmap for developing credible monitoring, reporting, and verification (MRV) systems in marine carbon removal. It outlines key stages, milestones, and considerations to help accelerate learning, reduce duplication, and guide informed investment.

[C]Worthy is building the scientific and technical foundation for credible marine carbon dioxide removal (mCDR), starting with C-Star, a software platform that uses regional ocean models to quantify how much atmospheric CO₂ is removed during an mCDR deployment. This post explores a model simulation of a hypothetical Ocean Alkalinity Enhancement (OAE) deployment, including the spread of added alkalinity and resulting reduction in atmospheric CO₂.