Plan Sea: Ocean Interventions to Address Climate Change – Détails, épisodes et analyse

In this episode of Plan Sea, hosts Anna Madlener and Wil Burns dive deep into the new Biogeosciences special issue focused on the environmental safety of ocean alkalinity enhancement (OAE). This episode’s guests are Dr.Lydia Kapsenberg and Dr. Tyler Cyronak who helped edit the special issue. Compiling more than 20 studies, the special issue serves as a “one-stop shop” of the latest peer-reviewed science on the environmental safety of OAE — ranging from responses of micro algae and corals, to the influence of biogeochemical cycling and trace metals. Tune in as we unpack what insights these studies collectively suggest and discuss what it means for next steps in environmental safety research for OAE. 

The volume of OAE research has grown dramatically in recent years — increasing four-fold over the last five years. The Biogeosciences special issue shines a light on this rapidly evolving landscape and offers a tool for researchers, funders, regulators, and other partners to access centralized information on potential ecological risks, environmental monitoring standards, and feedstock safety related to multiple OAE approaches. 

Throughout the discussion, many themes arise, including the question: How important is it to understand both system-wide patterns and local ecological realities? Lydia and Tyler highlight that while the Biogeosciences studies suggest that many phytoplankton species appear to be resilient under expected OAE conditions, local species and ecological contexts must still be factored into any field research design. This is where researchers have an important responsibility to meaningfully engage with communities on what matters most for their local marine ecosystems and align planned environmental monitoring efforts accordingly.

For researchers, policymakers, and communities assessing OAE’s environmental safety as a potential climate solution, the Biogeosciences special issue offers a crucial early evidence base and a clearer picture of what questions come next.

As mentioned during the episode, Carbon to Sea’s Environmental Impact Monitoring Framework is now available for public review and comment here, through December 12th. Carbon to Sea and the Prince Albert II of Monaco Foundation are also currently soliciting proposals for scientific research on the safety of OAE on commercially and culturally valued marine species. You can view the full funding opportunity and submit a proposal by January 16, 2026.

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative and the American University Institute for Responsible Carbon Removal.


ACRONYMS / CONCEPTS:

• CDR: Carbon Dioxide Removal
• EPA: Environmental Protection Agency 
• MRV: monitoring, reporting, and verification
• OAE: ocean alkalinity enhancement
• OAEPIIP: Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

In this edition of Plan Sea, hosts Anna Madlener and Wil Burns kick off season three of the podcast with Woods Hole Oceanographic Institution (WHOI) researchers Dr. Adam Subhas and Jennie Rheuban to discuss the LOC-NESS project — a small-scale, open-ocean research trial on ocean alkalinity enhancement (OAE). The project’s co-principal investigators join Anna and Wil to recount the process of receiving a first-of-its-kind permit from the U.S. Environmental Protection Agency (EPA), the role of local community engagement, and the project’s early findings. 

A few weeks ago, WHOI completed its highly controlled research trial in the Gulf of Maine to study the environmental safety and efficacy of OAE as a carbon dioxide removal technique. Approved by the EPA after a two-year, rigorous permitting process, the LOC-NESS project introduced small amounts of purified sodium hydroxide – a compound often used to balance the pH of drinking water – to the ocean surface waters, along with a harmless red dye to help track it. This field study came after years of preparation and development, including extensive laboratory experiments, ocean modeling, and a growing body of scientific literature. 

Dr. Adam Subhas is an Associate Scientist at WHOI and the project lead for LOC-NESS. Adam credits the project’s success so far to the comprehensive preparation and collaboration between WHOI scientists and EPA staff — on everything from ocean modeling and biogeochemical impact evaluation, to engaging communities and local industries on what to expect from the research. He also talks about how their pursuit of the first-ever ocean carbon dioxide removal (oCDR) permit under the Marine Protection, Research, and Sanctuaries Act of 1972, helped the LOC-NESS team refine their procedures, improve their approach, and make the project more responsive to feedback from their community.

Jennie Rheuban is a WHOI Research Specialist and serves as a co-principal investigator for LOC-NESS. Jennie points to community engagement as a critical component of LOC-NESS’s development, recounting the project’s years-long effort to engage with questions from a range of stakeholders, including the fishing community. By emphasizing its position as an independent scientific research project without commercial ambitions, WHOI was able to cultivate credibility and gather important community inputs that shaped the scope and methodologies of the research. For example, the team spent additional time researching types of fish larvae in potential field trial regions to bring that information back to the local fisherman.

Looking ahead, LOC-NESS researchers will continue to analyze data gathered during this summer’s trial to understand the impacts and efficacy of the alkalinity dispersal. 

More information about LOC-NESS’s findings will be shared at the Ocean Sciences Meeting in February 2026.

Plan Sea is a semi-weekly podcast exploring ocean-based solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal. 

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

This new episode features two OAE researchers and their insights from conducting field research as well as a special request to you, our listeners!

In this edition of Plan Sea, hosts Anna Madlener and Wil Burns are joined by two leading ocean alkalinity enhancement (OAE) researchers: Dr. Jaimie Palter from the University of Rhode Island’s School of Oceanography and Dr. Dariia Atamanchuk from Dalhousie University’s Department of Oceanography. Palter and Atamanchuk both lead field research sites studying OAE and are part of Carbon to Sea’s Field Research Steering Committee. 

Palter and Atamanchuk discuss their work leading field research sites studying OAE in coastal lagoon and ocean harbor settings, respectively, and share initial findings. The Plan Sea hosts and this episode’s guests underscore the importance of field research guiding the recommendation for scientifically robust, yet affordable and actionable monitoring, reporting, and verification (MRV) processes, and encourage greater collaboration between projects and across the sector.

Also: we would like to hear from you, our listeners, before our next episode! Let us know what 2024 milestone we should be celebrating or what you hope to see in 2025 by leaving us a voice message here that may be used in our next episode!

Acronyms used throughout the episode: 

• NOAA NOPP –  National Oceanic and Atmospheric Administration’s National Oceanographic Partnership Program (1:47) 
• AGU - American Geophysical Union (2:00)
• MRV - Monitoring, Reporting, and Verification (13:25)
• pCO2 - Partial pressure of carbon dioxide (34:58)
• EPA - Environmental Protection Agency (56:27)

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

In this edition of Plan Sea, hosts Anna Madlener and Wil Burns are joined by Captura CEO Steve Oldham to discuss Direct Ocean Capture technology. Captura is a Pasadena, CA-based company that is exploring the use of renewable energy to remove carbon from the ocean as a low-cost, large-scale climate solution.

Learn more about Captura’s DOC approach and propriety technology on their website here. 

Listen to our previous episode with Banyu Carbon’s Co-Founder & CEO Alex Gagnonon here.

Acronyms used throughout the episode:

• DAC - Direct Air Capture (6:38)
• RD&D - Research, Development, and Demonstration (21:21)
• KPIs - Key Performance Indicators (22:17)
• MRV - Monitoring, Reporting, and Verification (35:34)

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

In this edition of Plan Sea, hosts Anna Madlener and Wil Burns are joined by returning guest Mike Kelland, CEO and co-founder of Planetary Technologies, as well as Dr. Will Burt, Planetary’s Chief Ocean Scientist. Planetary is an ocean alkalinity enhancement (OAE) startup based in Halifax, Canada.

Link to Planetary's webinar on recent trial results here.

Listen to our first episode with Mike Kelland here.

ACRONYMS / CONCEPTS:

• NOAA (19:39): National Oceanographic and Atmospheric Association
• MRV (32:39): Monitoring, Reporting and Verification
• ROMS (34:35): Regional Ocean Modeling System
• EPA (53:06): Environmental Protection Agency
• London Convention and Protocol (53:41)

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

In today's episode, hosts Anna Madlener and Wil Burns are joined by Grace Andrews from Hourglass Climate. They discuss Hourglass' work on environmental monitoring and carbon removal quantification of Ocean Alkalinity Enhancement (OAE)  trials as a research non-profit.

To view the Ocean Visions webinar referenced on the podcast, click here: LINK.

Acronyms:

• MRV (1:42) 
• mCDR (3:28)
• USGS (18:51)
• EPA (19:32)
• NOAA (20:51)
• LCA (23:09)
• pCO2 (25:02)

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

In this edition of Plan Sea, hosts Anna Madlener and Wil Burns discuss a novel sunlight-driven approach to marine carbon dioxide removal (mCDR) with Alex Gagnon, co-founder and CEO of Banyu Carbon, a direct ocean removal startup based in Seattle, WA.

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

Hosts Anna Madlener and Wil Burns discuss the evolving landscape of marine carbon dioxide removal (mCDR) with Rory Jacobson, Acting Division Director for Carbon Dioxide Removal at the U.S. Department of Energy (DOE).

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

Plan Sea dives into the world of carbon removal certification, joined by experts Sophie Gill, Jing He, and Jennifer Yin from Isometric — a carbon credit certification platform and registry focused on high-quality carbon removal.

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.

Carbon to Sea & the American University Institute for Responsible Carbon Removal announce a new collaboration for the second season of “Plan Sea” — a semi-weekly podcast exploring ocean-based climate solutions. Plan Sea will release episodes on a semi-weekly basis throughout Fall 2024, and is hosted by Wil Burns and Anna Madlener.

Plan Sea is a semi-weekly podcast exploring ocean-based climate solutions, brought to you by the Carbon to Sea Initiative & the American University Institute for Responsible Carbon Removal.