Puro.earth is a carbon removal crediting platform that certifies durable carbon removal and issues CO2 Removal Certificates (CORCs) for each net tonne of CO2 removed and stored for hundreds or thousands of years. Our CORCs are issued and retired in the public.

Puro Registry, enhancing transparency in carbon markets.
We are excited to announce public consultation for our new carbon removal methodology: Direct Air Capture with Ocean Storage (DACOS). This innovative approach to carbon dioxide removal (CDR) leverages the ocean's ability to uptake CO2 from the atmosphere in a safe reactor-based setting.

What is DACOS?

DACOS is a groundbreaking CDR technology that combines direct air capture with ocean-based carbon storage. The process involves four key stages:
1) Take seawater into a reactor, and utilize electricity to change the pH of the water and split it into acidic and alkaline streams via electrolysis
2) Push air to flow through the alkaline water stream to take up additional CO2 from the ambient air in dissolved and solid forms
3) Neutralize and re-equilibrate the acidic water stream with alkaline rocks
4) Release re-equilibrated seawater from the reactor with stored dissolved carbon (bicarbonate) & solid carbon (calcium carbonate) and dispose of them in the ocean and on land

This methodology offers a durability of over 1,000 years, labeled with COR1000+, providing a robust solution for long-term carbon sequestration.

Sustainable Development Goals

DACOS carbon removal activities provide co-benefits and contribute to several UN Sustainable Development Goals:

• SDG 7 (Affordable and Clean Energy): Produces green hydrogen and catalyzes advancements in clean energy technology
• SDG 8 (Decent Work and Economic Growth): Creates high-value industries and jobs
• SDG 9 (Industry, Innovation, and Infrastructure): Encourages adoption of environmentally sound technologies and enhances resource efficiency
• SDG 17 (Partnerships for the Goals): Facilitates global transfer and adoption of sustainable technologies
  
  

Environmental and Social Considerations

While the DACOS pathway offers significant potential for carbon removal, it's crucial to address key environmental and social risks on methodology and project levels. The methodology introduces safeguards and monitoring processes for effectively managing environmental and social risks, such as:

1. Monitoring for potential local changes in ocean chemistry
2. Prevention of metal contamination from alkaline rock dissolution
3. Proper disposal of solid carbonates
4. Avoiding adverse impacts on water availability and quality
5. Preventing conflicts with community resources

To mitigate environmental and social risks, the methodology requires DACOS projects to perform thorough site-specific environmental impact assessments, including baseline ecological data. Projects must also adhere to occupational health and safety standards and engage continuously with local communities about potential impacts.

Period of Consultation

The public consultation will be open 29 January – 21 February 2025. We welcome feedback from all stakeholders during this period. Your input is invaluable to our methodology development process, ensuring transparency and informed decision-making.

Webinar 

A webinar will be held on February 5th, at 4pm GMT to cover key aspects of the process. Register for the webinar.   

Consultation Documentation

Please download the consultation documents via the links below and submit the provided feedback form to contact@puro.earth.

DACOS Methodology for CO2 Removal Edition 2025 v. 0.95
DACOS Public Consultation Feedback Form

Your insights and expertise will help us refine and improve this methodology for durable carbon removal. We look forward to your participation in shaping the future of ocean-based carbon storage solutions.

Collaboration and Innovation

This methodology is being developed in collaboration with Equatic, with key contributions from Edward Sanders (edward@equatic.tech) and Erika La Plante (erika@equatic.tech).

At Puro.earth, we believe that innovative carbon removal solutions like DACOS are crucial in our fight against climate change. We look forward to your participation in this public consultation as we work together towards a more sustainable future.

Stay tuned for more updates on our website and social media channels. Together, we can accelerate the carbon removal industry and make a lasting impact on our planet's health.