Climate Intervention

Keeping global warming below 2 °C will require atmospheric carbon dioxide removal (CDR) and/or solar radiation management (SRM), in addition to rapid greenhouse gas emissions reduction. The Climate Intervention theme focuses on research into the scientific assessment of regional and global scale CDR and SRM methods that are linked to the ocean and lower atmosphere. SOLAS does not work for the implementation of any of these methods but aims to support knowledge gain that informs public decision-making.

A range of proposed marine CDR and SRM methods in focus of SOLAS (not exhaustive). For a more comprehensive overview please refer to the Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP) report (http://www.gesamp.org/publications/high-level-review-of-a-wide-range-of-proposed-marine-geoengineering-techniques). Illustration by Rita Erven, GEOMAR Kiel.  

 

Representatives

Team leaders

Lennart Bach (Australia, lennart.bach@utas.edu.au)
Raquel Oliveira (Brazil, raquelrenoliveira@gmail.com)
 
 

Team members

Philip Boyd (Australia, philip.boyd@utas.edu.au)
Minhan Dai (China, mdai@xmu.edu.cn)
Erik van Doorn (Germany, edoorn@wsi.uni-kiel.de)
Daniel Harrison (Australia, Daniel.Harrison@scu.edu.au)
Linn Hoffmann (New Zealand, linn.hoffmann@otago.ac.nz )
Cliff Law (New Zealand, cliff.law@niwa.co.nz)
Lisa Miller (Canada, lisa.miller@dfo-mpo.gc.ca)
Arvind Singh (India, arvinds@prl.res.in)
 
 

Research Questions

What are the potential ecological impacts of large-scale marine CDR methods on ocean biodiversity and ecosystem services?

How effective are various marine-based CDR methods in sequestering atmospheric CO2 over long timescales?

What are the regional climate effects of SRM techniques that involve the ocean and lower atmosphere?

What are the socio-economic and ethical considerations associated with deploying marine CDR and SRM technologies?

How can monitoring, reporting and verification be developed to ensure the transparency and accountability of marine CDR and SRM interventions?

 

Priorities

Laboratory experiments

Laboratory studies test the effectiveness and impacts of various CDR and SRM methods under laboratory settings. By controlling variables, researchers can closely observe ecological responses, carbon sequestration efficiency, and potential side effects. These controlled experiments provide critical data to predict real-world outcomes, refine techniques, and develop monitoring systems, ensuring that any proposed interventions are both effective and environmentally responsible.

Contained field experiments

Contained field experiments will test CDR and SRM methods in real-world marine settings, while minimising environmental risks (e.g. via mesocosms). These experiments will provide data on ecological impacts, carbon sequestration efficiency, and regional climate effects. By closely monitoring these controlled environments, researchers can refine techniques, validate laboratory findings, and develop reliable monitoring systems, assessing whether interventions would be effective and safe.

Field studies

Field studies will implement CDR and SRM methods in diverse marine environments to observe their real-world impacts. These studies will provide comprehensive data on ecological effects, carbon sequestration efficiency, and regional climate changes. By monitoring natural settings, researchers can validate laboratory and contained field experiment results, refine techniques, and ensure that interventions are effective, safe, and scalable for broader application.

 
Natural analog studies

Natural analog studies will examine existing marine environments that naturally exhibit conditions similar to those created by CDR and SRM methods. By studying these analogs, researchers can gain insights into long-term ecological impacts, carbon sequestration processes, and regional climate effects. These observations help validate laboratory and field experiment findings, refine intervention techniques, and ensure that proposed methods are both effective and environmentally sustainable

 

 

 

 

Events

56th International Liège Colloquium on Ocean Dynamics: Marine CDR Emerging Views and Challenges, 26-30 May 2025, Liege, Belgium.

 

 

 

Recent Research Highlights

SOLAS synthesis paper

Bach, L.T., Vaughan, N.E., Law, C.S., & Williamson, P. (2024). Implementation of marine CO2 removal for climate mitigation: The challenges of additionality, predictability, and governability. Elem. Sci. Anth., 12(1): 00034. https://doi.org/10.1525/elementa.2023.00034

Sponsors

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