Study: There is less room to store carbon dioxide, driver of climate change, than previously thought
By: Kai Bennett
Background:
CO2 emissions produced from the burning of fossil fuels are the largest contributor to the rise in global temperature. One strategy for limiting the amount of CO2 emissions that are released into the atmosphere is carbon capture and storage. These technologies are designed to collect CO2 from a human source such as a power plant, compress the gas, then pump it underground in a way that it cannot escape into the atmosphere.
There are certain requirements that must be met for land to be suitable for the injection process. These requirements are due to concerns regarding the ability for the CO2 to escape back to the surface or to cause earthquakes if situated near tectonic plates. However, previous assessments had determined that there is more land that meets these requirements than would be required for even a significant increase in carbon capture usage.
News Article:
In the article “Study: There is less room to store carbon dioxide, driver of climate change, than previously thought,” from the news outlet Independent, Tammy Webber outlines how the findings of a new study contradict the previously established potential for CO2 storage. The article describes a 10-fold reduction in global carbon dioxide storage capacity that will significantly lessen the amount of global warming that carbon capture was predicted to be able to mitigate, from 5-6°C to 0.7°C.
Webber provides the context that plans to achieve the goals set by the 2015 Paris Agreement relied on carbon capture and storage to a degree that is not consistent with the realistic potential for storage. The article includes quotes from the study’s authors, explaining that these assumptions for carbon capture capacity had not been tested and had not considered the limitations of vulnerable areas. However, the authors are also cited in emphasizing that carbon capture and storage is still an important strategy.
Expanding on the scope of the topic, Webber dedicates some of the article to how carbon capture works and presents prior criticisms. The article also presents the opinions of industry officials from the Carbon Capture Coalition, who stand by the effectiveness of carbon storage and argue that new technologies will improve the potential volume of CO2 that can be stored. Also cited is Rob Jackson, the head of the Global Carbon Project, who expressed his simultaneous optimism that carbon capture is a successful technology as well as the perspective that its effectiveness is unlikely to reach its full potential due to such strategies being expensive and that promising future carbon capture is ultimately circumventing the root of the problem of reducing emissions.
Scientific Article:
The peer-reviewed article referenced by the Independent news article is entitled “A prudent planetary limit for geologic carbon storage,” and was published in the journal Nature. In this study, the authors perform spatial analysis with risk assessment to estimate the planetary limit for carbon dioxide storage. It outlines the methods they used for developing a map of acceptable sedimentary basins, this includes the different exclusion layers based on geographic factors as well as a series of risk factors that they considered.
After applying the exclusion layers, the authors found that their initial calculated potential of 11,800 GtCO2 becomes around 1,460 GtCO2. In the section "Implications for future mitigation strategies,” the authors describe different scenarios of global warming mitigation and the extent to which carbon capture and storage would need to be scaled up to accommodate mitigation outcomes. Depending on the level of stringent mitigation, the maintenance of necessary carbon storage is predicted to breach the proposed threshold within 120-250 years across the majority of scenarios.
The authors emphasize that any amount of this proposed threshold that is used to justify and continue the use of burning fossil fuels, reduces the maximum warming that is reversible by carbon capture and storage, and as such their cap of 0.7°C is likely a significant overestimate. Because of this, the authors predict that the current climate policies will fail to meet the 1.5°C limit of the Paris Agreement.
Analysis/Review:
Overall, the main issue of the article and study is that we cannot rely on retroactive solutions to the issue of climate change. Carbon capture and storage is one of the many important steps the world must take to mitigate the rising temperatures, but ultimately the dramatic reduction of fossil fuel use is the highest priority. The effectiveness of carbon capture as a method has not only been overestimated, but the perception of it as a solution that we will get to eventually while we continue to burn fossil fuels allows for the true solution to be pushed down the road.
One significant shortcoming of the news article is that it does not directly link to or name the study that it is referencing, making it less convenient for individuals to seek out the original source of the information to do their own research. However, by including quotes from the authors and their names as well as the journal that the study was published in, it is not difficult to find the article by doing some light research.
Additionally, the media article largely ignored the specifics of the risk factors considered by the researchers and did not address the heterogeneity of how these factors impacted different regions and countries. It is debatable whether or not including this information would have made a significant improvement in the content to be communicated to the general public, however these pieces of information are highly relevant to the application of policy changes.
Despite these shortcomings, I believe that the article from Independent did an impressive job at communicating the most relevant information from the study as well as integrating quotes and informative context from outside sources. The information from the study’s authors is represented with enough detail for someone to understand with minimal prior knowledge of carbon capture technology. There is a significant degree of nuance regarding the issue of capturing and storing CO2 because it is an action that can have a positive to neutral impact, but it will also be required at a scale that is much more broad than present, and its influence is still not a replacement for other climate action. I think the news article managed to present this issue with this nuance sufficiently displayed.
For these reasons, I give this article an 8/10.
Citations:
European Commission. Causes of climate change. Climate Action. https://climate.ec.europa.eu/climate-change/causes-climate-change_en
Gidden, M. J., Joshi, S., Armitage, J. J., Christ, A.-B., Boettcher, M., Brutschin, E., Köberle, A. C., Riahi, K., Schellnhuber, H. J., Schleussner, C.-F., & Rogelj, J. (2025). A prudent planetary limit for geologic carbon storage. Nature, 645(8079), 124–132. https://doi.org/10.1038/s41586-025-09423-y
Herzog, H. (2025, August 8). Carbon capture. MIT Climate Portal. https://climate.mit.edu/explainers/carbon-capture
Webber, T. (2025, September 3). Study: There is less room to store carbon dioxide, driver of climate change, than previously thought. The Independent. https://www.independent.co.uk/news/study-carbon-dioxide-international-energy-agency-b2819437.html
Thank you Kai for this interesting article and the analysis you have done! Very well done!
ReplyDeleteA 10x difference in the prediction that has been mentioned here is huge - I wonder why the previous results were so far off. Do you know what caused that? Could it be that the earlier studies were conducted by the oil and gas industry themselves, and they inflated the number (potential for carbon removal) to justify continuing their operations?
Additionally, when they talk about global CO2 storage potential, how accurate is their data for the entire planet? Most CO2 emissions come from industrialised countries and countries of the Global North, so how useful is knowing the global storage potential? Would the captured carbon be shipped to other countries that didn't produce them? How does that work - especially if the emissions sources and the optimal storage sites are far apart?
Hi Frozan, thank you for your comment. The 10-fold reduction in carbon storage capacity is actually not a comparison to prior research; the process of the study involved the researchers identifying the sedimentary basins that could potentially be used for storing CO2, then applying exclusion layers to this map. As a result, the 10x difference is actually just the difference between the potential land they analyzed and the land that ultimately met the requirements of their risk assessment.
DeleteI appreciate your question about how this storage is distributed worldwide, as this is a part of the issue that is critical to the actual application of policies. This is an area mentioned in the scientific article that is not mentioned in the news article. In the implications of their research, the authors mention that in a future where we are utilizing the available storage capacity to a significant extent, there would certainly need to be "large-scale transfers" of CO2 into some developing nations that have low emissions but high storage potential. This introduces additional risk of leakage during transport and implications for the exploitation of nations that have no domestic incentive to take on the burden from large global powers.
Thank you Kai for taking the time to reply!
DeleteHi Kai, thanks for this clear and insightful review! I strongly agree with your point that the news article "ignored the heterogeneity of how these factors impacted different regions." I think this is a critical oversight with massive geopolitical implications.
ReplyDeleteThe study recalculates a planetary limit, but suitable geology for CO₂ storage is not evenly distributed. (It would be better to attach the paper's graph to this blog.) It's likely concentrated in a handful of countries. This creates a scenario where some nations have a potential disposal solution (even if it's a limited one) while others have none. Could countries with storage capacity leverage it for political power, perhaps by charging other countries for storing their emissions or using it as a bargaining chip in climate negotiations? It feels like this new, smaller potential for CCS makes the principle of "common but differentiated responsibilities" even more difficult.
Also, the news mentioned that industry officials remain optimistic about CCS, even though this study drastically reduces the scale of that technological backstop. Do you think this finding will be enough to force a more honest conversation about the immediate need to phase out fossil fuels?
Hi Kai. Thank you for posting an interesting article and peer-reviewed paper. I like how the article and paper take into account the limitations and dig deeper into what is actually going on with CO2 emissions and how to mitigate them. It informs people of the reality of CO2 storage techniques and explains the limitations and incorrect assumptions. I believe this to be very vital to the future success of limiting CO2 and discovering new practices to manage the emissions. I also found your review to be very helpful as you highlight the priority to manage CO2 pollution as well as explaining that it can cause different effects based on region.
ReplyDeleteAgain, you highlight limited use of fossil fuels as the main priority in mitigating emissions. To what degree of importance do you think this has over carbon capture and storage, as well as to other tactics to tackle these emissions?
Great analysis, Kai! I found the fact about how carbon capture triggers tectonic activity to be really interesting. Do you know what specific factors about an area either add or subtract from its effectiveness/longevity at carbon capture? I'm especially curious about the environmental impacts of carbon sequestration, aside from the re-release of CO2 into the atmosphere. The article briefly mentioned how carbon sequestration could impact an area's groundwater, in addition to create earthquakes. Does the peer reviewed article mention what environmental factors contribute to these different impacts of carbon capture, or if they are unilateral effects of carbon sequestration? Overall, I agree that the Independent article did an excellent job of breaking down complex scientific concepts, and I think that given the dramatic decrease in carbon capture ability (from 5.6 to 0.7ºC!!), this is incredibly valuable information to be accessible to non-scientific audiences.
ReplyDeleteHi Kai, thanks for the interesting read! It was really exciting to read about research very recently published in nature. I think you make a very fair point about the shortcomings of the article, especially with respect to the author not including specifics of the risk factors here. The paper makes a point of discussing that relying on carbon storage and continuing to burn fossil fuels would result in this value being an overestimate. While there is a balance to strike between communicating science accurately and not panicking a population, I do think it is a crucial point to make that the number provided by this study is entirely dependent on reducing emissions in tandem. News articles like these communicate to the public the current situation we're in with respect to climate, and to provide people with information that will inform their own perspectives. Personally what I found shocking about this Nature paper is how long it has taken for a systematic and in depth study to be released that provides a risk-based analysis of geologic carbon storage. Considering the Paris Agreement heavily relied on this technology, and that it happened 10 years ago, one would think that such a detailed study should have happened much sooner. I think an additional call-to-action in the paper and the article discussing other areas of our climate plans that could benefit from such an analysis would have been prudent. What other areas do you think could benefit from this treatment? This made me curious whether the predictions of reduced emissions based on renewable sources factor in the emissions from mining and startup costs-- do our current models account for this as well, or is the information we use for other climate policy also suffering from a lack of risk-assessment?
ReplyDelete