Is carbon dioxide capture and storage (CCS) an important tool for slowing climate change, or merely a way to justify the continued extraction and burning of fossil fuels, asks Nils Markusson. I’m a social scientist who studies the politics of environmental technology and I have given this question a lot of thought.
CCS is a technology that can separate out carbon dioxide (CO₂) from industrial facilities, like a coal-fired power plant or a cement factory, and sequester the CO₂ underground so as to keep it out of the atmosphere.
The technology works and has been demonstrated to some effect on industrial plants. CO₂ storage underground has been demonstrated in Norway since the 1990s.
A lot of energy and water is used to do this and there is no market for the stored CO₂ in the UK. This means CCS will not be commercially viable without policies such as a legal mandate for companies to use it.
The UK government’s climate policy is defined by the concept of 'net zero'. This entails phasing out emissions and scaling up methods of removing CO₂ from the atmosphere to reach a point where sources and sinks of the gas are balanced.
Hard to eliminate
Some emissions, such as those from steelmaking, are often expected to be hard to eliminate in the time left to avert catastrophic warming. Governments propose compensating for these by using carbon removal technologies, where CCS is used to capture CO₂ from burning or processing biomass or to extract CO₂ directly from the air.
A high court ruling in 2022 ordered the government to outline how its policies will meet the legally binding target of reaching net zero by 2050. The British government has now released its revised plans which will include storing CO₂ below the North Sea using new carbon capture sites in Teesside, funded with £20bn over 20 years. The government may also license a large new oilfield in the North Sea called Rosebank.
Is this an example of CCS being used to delay real cuts in emissions as some have alleged? A recent paper published by myself and fellow researchers offers some insight by reviewing decades of research on the topic of delay caused by carbon removal technologies.
What do studies say?
So far, critics seem to have a point. CCS has been very slow to get off the ground and successive UK governments have botched attempts to demonstrate the technology at scale.
Our research traced the debate back to the 1990s when economists first modelled how emissions reductions might be substituted with carbon removal technology to reveal the cheapest way to decarbonise.
This aroused interest in carbon removal (and solar radiation management, which involves bouncing the sun’s energy back to space) technology, but the results were controversial as even then climate scientists were wary that they could replace vital cuts to emissions.
The problem of whether carbon removal actually deters or delays emission reductions has been conceptualised and studied in multiple ways by academics. Few deny the risk altogether, but conclusions vary as to how serious it is.
Some studies look at integrated assessment models – complex computer models of the climate system which use economics to describe how emissions might change depending on the technologies used to handle them.
These studies tend to find that introducing the option of carbon removal into projections of how countries can decarbonise does indeed substitute emissions reductions to some extent.
Authors disagree on how relevant these findings are to what happens in the real world. But we know from other studies about the performative effects of modelling studies: their findings tend to shape policy, and so real-world outcomes, meaning results showing substitution effects should not be dismissed.
A large number of studies assess the allure of carbon removal on individuals by, for example, asking policy makers or members of the public about the kinds of decision they would make or would like to see made. These studies are among the most sceptical about the risk of carbon removal acting as a deterrent to cutting emissions, with some even suggesting an opposite effect.
Political economy matters
In our review, we argued that it is in these cases where the relevance of experimental results for real-world outcomes must be taken with a pinch of salt.
These methodologies tend to assume that individual preferences are what matters in shaping climate policy, and that rational calculations by people concerned with finding the most efficient solution to a problem determine what decisions are made. We argue that any number of social, cultural, political and economic processes make the world much messier than that.
Structural accounts of the role of carbon removal aim to take such processes into account. These studies tend to find stronger support for carbon removal delaying and deterring emissions reductions by considering the context created by political economy – that is, the influence of powerful economic interests on political systems and government policy.
Most of these studies are, to date, highly theoretical, and more empirical assessments are needed, including case studies which analyse the processes governing the creation of particular policies.
While the new government plan was billed as an 'energy security strategy', it contains no significant proposals to insulate leaky houses, which experts have consistently argued would reduce demand for foreign sources of energy, cut household emissions and alleviate bills.
This would have been a reasonable priority during a so-called cost-of-living crisis. But home insulation does nothing to shield the profits of fossil fuel companies or landlords in the large and growing private rental sector.
When the political economy in which climate policy making happens is considered, the repeated role of CCS, be it on fossil fuelled plants or in carbon removal, is revealed: a handy excuse to delay reform and protect the profitability of powerful sectors of the economy.
This article first appeared in The Conversation, and was written by Nils Markusson, lecturer in environmental politics, Lancaster University.