Two new studies call for clear frameworks for coastal CO₂ sequestration

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Two new studies call for clear framework conditions for CO₂ sequestration in coastal areas, including a digital twin for projections and an independent body for certification and new legal structures for monitoring.

The two papers led by researchers from Helmholtz-Zentrum Hereon were recently published in Environmental Research Letters and Elementa.

So-called "blue carbon ecosystems" for CO₂ storage on the coasts and in the ocean can be seagrasses, mangroves or salt marshes, for example. Whether they help to achieve the climate targets and how this can be achieved still needs to be researched in more detail.

Projects for CO₂ storage are increasingly being initiated by science and industry. But the risks need to be better researched and regulated, say the authors. International legislation is needed for this. Only then could a blue carbon industry be established.

Clear rules for an industry with a future

Regulation through legislation and evaluation are important, says lead author Bryce von Dam from the Hereon Institute of Carbon Cycles. However, this can only be achieved with an international, overarching organization for monitoring, reporting and verification. This organization could issue certificates and create fair conditions.

The Paris Climate Agreement is intended to help regulate carbon removal. But until it is fully ratified, there must be other verification bodies. Furthermore, smaller projects should not be disadvantaged—as long as they demonstrably remove greenhouse gases from the atmosphere, say the authors.

"In addition, a digital twin that models baseline scenarios and shows what the carbon cycle would look like without blue carbon activities can help. This works well if it collects real data in real time," says von Dam. The twin should create AI-supported "what-if scenarios" regarding the effectiveness of storage methods.

Stronger links between business and science

Hereon Institute Director Helmuth Thomas and other researchers have come to the conclusion that the role of coastal and marine ecosystems can contribute to combating climate change. "But only if we find new international governance and legal frameworks." This is also important in order to recognize unexpected side effects.

Only with a clear legal definition could science, business and politics jointly create frameworks. One example would be to clarify liability issues. "Some measures in the wrong place can even lead to an increase in CO₂ emissions," says Thomas.

The effectiveness of individual projects needs to be much better researched and evaluated. It is also unclear, for example, to what extent international law already obliges states to restore marine habitats. Binding political guidelines are needed.

More information: Bryce Van Dam et al, Towards a fair, reliable, and practical verification framework for Blue Carbon-based CDR, Environmental Research Letters (2024). DOI: 10.1088/1748-9326/ad5fa3 online.ucpress.edu/elementa/ar … dioxide-removal-help

Martin Johnson et al, Can coastal and marine carbon dioxide removal help to close the emissions gap? Scientific, legal, economic, and governance considerations, Elem Sci Anth (2024). DOI: 10.1525/elementa.2023.00071

Journal information: Environmental Research Letters

Provided by Helmholtz Association of German Research Centres