Schlagwort: ocean-based CDR

Nature – Rosentreter et al. (2023): Coastal vegetation and estuaries are collectively a greenhouse gas sink

Judith A. Rosentreter, Goulven G. Laruelle, Hermann W. Bange, Thomas S. Bianchi, Julius J. M. Busecke, Wei-Jun Cai, Bradley D. Eyre, Inke Forbrich, Eun Young Kwon, Taylor Maavara, Nils Moosdorf, Raymond G. Najjar, V. V. S. S. Sarma, Bryce Van Dam, Pierre Regnier IN: Nat. Clim. Chang.;

Coastal ecosystems release or absorb carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), but the net effects of these ecosystems on the radiative balance remain unknown. The authors compiled a dataset of observations from 738 sites from studies published between 1975 and 2020 to quantify CO2, CH4 and N2O fluxes in estuaries and coastal vegetation in ten global regions.


Wei et al. (2023): Can ocean carbon sink trading achieve economic and environmental benefits? Simulation based on DICE-DSGE model

Zhenhao Wei, Xuzhao Jiang, Zhibo Zhao, Wenli Xu, Lingyi Guo, Qiaoyu Zheng IN: Environ Sci Pollut Res,

Low-carbon development requires joint efforts in terms of “carbon reduction” and “carbon sink increase.” This study thus proposes a DICE-DSGE model for exploring the environmental and economic benefits of ocean carbon sinks and provides policy suggestions for marine economic development and carbon emission policy choices.


UK plans carbon capture ‘treasure mapping’ for North Sea to attract investors and developers

by Davide Ghilotti,, 9 May 2023 14:53

„Regulator will have powers to compile survey data into ‘most comprehensive’ picture of carbon storage capacity. […] The aim is to produce what the government described as the “most comprehensive picture yet of UK’s carbon capture and storage potential” for prospective investors and developers.“


UK Start-up Launches Seaweed Project To Combat Climate Change

by Agility PR Solutions,, May 10, 2023, 00:43 GMT

„Carbon Kapture, a start-up dedicated to the removal of CO₂ from the atmosphere, announce the launch of its first seaweed farm. The company has developed a business model allowing its customers to sponsor seaweed grown on ropes to absorb CO₂ directly from the sea. It then converts the seaweed into biochar, a stable form of carbon that can be used to enrich soil and reduce the need for fertiliser. Carbon Kapture has partnered with shellfish farmers in Ireland to grow the seaweed, with plans for its first farm to become even larger than Amazon’s newly funded North Sea Farm 1 project by the end of the year.“


Webinar: Scrubbing the Skies – Developing a Verification Approach for Open Ocean CDR

May 16; ·7 – 8 pm CEST hosted by Institute for Carbon Removal and Policy 

This webinar focuses on how quantification approaches for open ocean carbon removal projects be informed by best practices from other fields or project types. The panelists will also discuss how to adapt coastal macroalgae species to “succeed” in an open ocean environment. Finally, they will discuss how the emerging CDR industry should think about the verification of new carbon removal systems.


Take Care Before Enlisting the Oceans in the Climate Fight

opinion by Lara Williams, on, May 3 2023, 10:09 MESZ

„Rapid progress is being made in ocean-based carbon removal, but there’s a risk the sector is outpacing knowledge and regulation. […]There’s a lot of momentum behind ocean-based carbon dioxide removal (CDR), with hundreds of startups clamoring for funding. But, as new research from climate non-profit Carbon180 lays out, the sectorrisks outpacing scientific knowledge and regulation. “Because there’s so much uncertainty, there’s potential for irresponsible deployment of these types of carbon removal projects,” Sifang Chen, author of the report, told me. “We need to make sure safeguards are put in place.”


Rohling (2023): Marine methods for carbon dioxide removal: fundamentals and myth-busting for the wider community

Eelco J Rohling IN: Oxford Open Climate Change, kgad004,

This review outlines the basic operation of the marine carbon cycle in straightforward terms, with some simplifications, to help advance the debate among the wider community. Break-out boxes provide additional detail where desired, and references (and the sources cited therein) provide avenues for further study. The review then discusses two potential marine methods for atmospheric carbon removal that are thought to offer the greatest potential in terms of carbon removal mass: ocean iron fertilization and ocean alkalinity enhancement.


Mit CO2-Verpressung das Klima retten – wirklich?

Podcast von Susanne Tappe und Ines Burckhardt,; Sendereihe Mission Klima – Lösungen für die Krise, 21.04.2023, 06:00 Uhr, 36 min

„Wäre es nicht schön, man könnte all‘ das schädliche CO2, das unsere Erde erhitzt, unters Meer pressen – und unsere Klima- Probleme wären gelöst? Diese Hoffnung erweckt die zurzeit auch von Politikern wie dem grünen Wirtschaftsminister Robert Habeck beworbene Technik CCS – also die Technik, CO2 abzuscheiden und unterirdisch zu speichern, zum Beispiel unter dem Meeresgrund. Habeck will bald einen Gesetzesentwurf einbringen, um das Verpressen vor der deutschen Küste zu erlauben, auch der Export etwa nach Norwegen ist angedacht. Doch viele Umweltschützer (wie Kerstin Meyer vom BUND, die interviewt wurde) sind skeptisch, dass die CO2-Speicher auch wirklich dicht sind – und bezweifeln auch, dass CCS wirklich was fürs Klima bringt… Die Autorinnen nehmen die Technologie deshalb in dieser Folge mal genau unter die Lupe.“


Fakhraee et al. (2023): A biogeochemical model of mineral-based ocean alkalinity enhancement: impacts on the biological pump and ocean carbon uptake

Mojtaba Fakhraee, Zijian Li, Noah J Planavsky, Christopher T Reinhard IN: Environ. Res. Lett. 18, 044047,

The authors used a series of biogeochemical models to evaluate the gross CDR potential and environmental impacts of ocean alkalinity enhancement using solid mineral feedstocks. The authors find that natural alkalinity sources—basalt and olivine—lead to very low CDR efficiency while strongly perturbing marine food quality and fecal pellet production by marine zooplankton.


Nature – Eger et al. (2023): The value of ecosystem services in global marine kelp forests

Aaron M. Eger,  Ezequiel M. Marzinelli,  Rodrigo Beas-Luna,  Caitlin O. Blain,  Laura K. Blamey,  Jarrett E. K. Byrnes,  Paul E. Carnell,  Chang Geun Choi,  Margot Hessing-Lewis,  Kwang Young Kim,  Naoki H. Kumagai,  Julio Lorda,  Pippa Moore,  Yohei Nakamura,  Alejandro Pérez-Matus,  Ondine Pontier,  Dan Smale,  Peter D. Steinberg, Adriana Vergés IN: Nature Communications 14, 1894

The authors present a global estimate of the ecological and economic potential of three key ecosystem services – fisheries production, nutrient cycling, and carbon removal provided by six major forest forming kelp genera (Ecklonia, Laminaria, Lessonia, Macrocystis, Nereocystis, and Saccharina). Each of these genera creates a potential value of between $64,400 and $147,100/hectare each year.