The Ocean Alkalinity Enhancement (OAE) Environmental Impact Monitoring Framework provides essential guidance for researchers, regulators, funders, industry stakeholders, and the public on how to evaluate the environmental impacts of OAE approaches during field research.

Developed in partnership between PML Applications and the Carbon to Sea Initiative, this framework extends existing codes of conduct for ocean-based carbon dioxide removal (oCDR) researchers. As oCDR and OAE research projects begin to move from the lab to field trials — an essential step to rigorously evaluate how these approaches work in real-world conditions — this framework defines specific environmental monitoring needs and considerations for OAE field trials. This document aims to promote human and environmental safety, transparency, and accountability across the fast-growing oCDR community.

The framework is structured around a phased and gated approach, allowing OAE projects to scale up gradually, as knowledge grows and potential risks are mitigated. It draws from established environmental standards, government regulations, lessons from past field trials, and community best practices.

With gratitude to the many experts who offered feedback through two closed comment groups and a workshop, we have incorporated the suggested revisions and are now opening this vital document for its first public review and comment period. Feedback from a broad range of practitioners and other stakeholders is invaluable as we collectively work towards robust and responsible evaluation of OAE. Public comments and resolutions will be published here alongside the final version of the framework — which will also be updated periodically to reflect ongoing sector knowledge and progress.

Please submit your comments by Friday, December 12, 2025, after which the comment period will be closed. Feedback will then be summarized, and a revised version will be published.

If you have questions or concerns, please email info@carbontosea.org.