Concerns and Questions About Carbon Dioxide Removal Technologies

[Geoengineering News]

https://wires.onlinelibrary.wiley.com/doi/10.1002/wcc.70063?prg140729=de1646d9-5aa7-496a-a59f-9d04f8e975a8

Authors: Joshua Luczak

First published: 21 May 2026

https://doi.org/10.1002/wcc.70063

Abstract

Carbon dioxide removal (CDR) technologies are increasingly positioned as essential tools for meeting global climate targets, yet their development and potential deployment raise a complex set of technical, moral, social, and political concerns and questions. These issues are often discussed in isolation, with technical and scientific debates proceeding independently of moral and sociopolitical scrutiny, and vice versa. This article offers an integrated review of CDR that brings these distinct concerns and questions together in one place. It notes scientific and technical challenges alongside moral, social, and political ones. By placing these issues together, the article provides a more complete picture for evaluating CDR research, development, and deployment.

Source: Wires

[Greg Rau]

This paper raises the important point about distinguishing CDR research from deployment, a distinction central to current calls for research-only mCDR (eg: most recently here).  From the Luczak paper::

"Issues and questions arise at the boundary between CDR research and deployment.52 An issue here is that, for some CDR technologies, especially those undertaken at large spatial scales or in shared environments, the distinction between research, testing, and deployment becomes difficult—if not impossible—to sustain. Because many CDR techniques aim to alter global or regional climate systems, there are strict limits on what can be learned from modeling, laboratory studies, or small-scale field trials. As a result, generating meaningful knowledge about their effects may require interventions of a scale that already produce the very impacts that governance and ethical scrutiny are meant to regulate.

This collapse of the research–deployment distinction is itself a substantive concern. Large-scale “tests” of technologies such as ocean fertilization or enhanced weathering may be functionally equivalent to deployment in that they alter ecosystems or atmospheric processes in ways that are spatially dispersed, difficult to reverse, and capable of producing “winners” and “losers.” If so, then characterizing such activities as research risks obscuring their moral and political significance, and may allow consequential interventions to proceed under weaker governance standards than would apply to acknowledged deployment."

How about the idea that deployment happens when CDR credits are claimed, regardless of scale/duration of the activity? Thus, governance of any (m)CDR activity should only hinge on scale, where, how, and possibly who, but not why.  Certainly, governance needs to scale with the size/duration/magnitude of the risks/impacts posed, but the motivation of the activity - research vs deployment - is irrelevant if the purpose of governance is simply environmental/social protection.  If I am going to dump 100 t of alkaline minerals into the ocean, the issue is environmental/social protect, not is this pure dumping, is this research or is this deployment for mCDR. For that matter mCDR should get a governance break because its benefits (CO2 and ocean acidity reduction, if properly documented) could (help) offset any negative impacts otherwise imparted. Or what am I missing?

Greg

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Greg H. Rau, Ph.D.

Senior Research Scientist
Institute of Marine Sciences
Univer. California, Santa Cruz
https://www.researchgate.net/profile/Greg_Rau
Co-founder and manager, the Carbon Dioxide Removal Google group
Co-founder and Senior Scientist, Planetary Technologies, Inc.
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