Today, Carbon to Sea is proud to share our 2025 Annual Report, a comprehensive overview of progress made towards evaluating ocean alkalinity enhancement (OAE) over the past year. 

In 2025, we advanced fundamental science of OAE, helped launch first-of-their-kind field research studies to generate real-world evidence, strengthened engagement with global government leaders, and advanced best practices to enable transparency and cross-sectoral collaboration. 

“This report takes stock of our work in 2025 — a pivotal year for our organization and the field of OAE writ large,” said Antonius Gagern, Executive Director of Carbon to Sea in his letter that introduces the report. “I think that everyone will take away something slightly different, but, to me, three high-level observations jump out above all: We’re narrowing the solution space; the first wave of real-world demonstrations pave the way for field research in coming years; and OAE is gaining significant interest from governments and NGOs.”

We look forward to building on this work in 2026. To learn more, read our full Annual Report online here or download a complete PDF here: