Take the sheep away and the soil loses carbon: a result nobody expected
What happened
A study published on 23 September 2026 has produced a result that runs against what a lot of people assume about land and climate. The common assumption is that taking livestock off the land is good for the soil and good for carbon. Fewer animals, less trampling, more plants, more carbon stored underground. Researchers working in sub-arctic grassland in Iceland found the opposite. The work appears in the journal Global Change Biology Communications and was led by Dr Anna Gudrun Thorhallsdottir at the University of Iceland at Holar. The team compared grassland where grazing had been stopped long ago with grassland that had been grazed continuously. Where grazing had ceased, the amount of organic carbon in the soil had fallen. Where grazing continued, soil carbon stayed higher. Over longer periods, land where grazing had stopped also shifted towards different types of vegetation, and those newer plant communities held less carbon in the soil beneath them. "The findings have important implications for climate policy, nature-based solutions, and sustainable grassland management worldwide," Dr Thorhallsdottir said. "They highlight the potential importance of grazing to sustain grasslands and enhance soil carbon storage." The underlying mechanism is about roots. Grassland plants push a great deal of carbon down into the soil through their root systems, where most of it stays. Grazing keeps those grasses growing and keeps that pump running.
Why this matters
Soil holds more carbon than all the world's plants and the atmosphere combined. Small changes in how much soil stores add up to very large numbers globally. That is why land management has become a climate question as well as a farming one, and why phrases like nature-based solutions and rewilding now appear in policy documents rather than just in nature writing. This study is a useful corrective, though not in the way either side of that argument might hope. It does not show that livestock are good for the climate. Livestock, particularly cattle, produce methane, and that is a separate and substantial issue this study does not address at all. What it shows is narrower and more interesting. In this particular kind of landscape, grassland, the relationship between grazing animals and soil carbon is not the simple negative that is often assumed. Grasslands evolved alongside grazing animals. Remove them entirely and the system changes, sometimes in ways that store less carbon rather than more. For anyone who follows debates about rewilding, land use or where food should come from, that is worth knowing. The honest position is that these questions are genuinely complicated and that the right answer depends heavily on which landscape you are standing in.
What the evidence actually says
This is one peer-reviewed study in one type of landscape, and it should be held at that weight. Its strengths: it is published in a peer-reviewed open access journal, it uses long-term grazing cessation rather than a short experiment, and it measures soil organic carbon directly rather than modelling it. The limits are important. Iceland's sub-arctic grasslands are a specific environment: cool, volcanic soils, particular plant communities, a long history of both grazing and erosion. Results there do not automatically apply to a Lincolnshire pasture, a Welsh hillside or a tropical savanna. The study compares places rather than running a controlled experiment across identical land. Fields that were destocked and fields that were not may differ for other reasons, including why they were chosen for each fate in the first place. It also measures soil carbon, not the full climate balance. Adding in methane from animals, the emissions of running a farm, and what happens to the land instead would give a different and more complete picture. And there will be a level of grazing that is too much. The study points to sustained grazing sustaining carbon, not to grazing being limitless in its benefits. Overgrazing degrading soil is very well documented. The fair conclusion is that "remove the animals and the carbon will look after itself" is too simple, and that grassland management needs more thought than a slogan.
Practical advice
This is a research finding rather than something most people can act on directly, but it does change how to read a familiar set of arguments. - Treat blanket claims about livestock and climate with care, in both directions. The picture differs sharply between beef feedlots, upland sheep and sub-arctic grassland. - Distinguish between soil carbon and total emissions. A study about one is not a study about the other. - If you garden or manage a small piece of land, the general principles still hold: keep soil covered, avoid leaving bare ground over winter, and disturb it as little as you can. Roots and plant cover build soil carbon. - If you follow rewilding debates locally, ask which landscape is being discussed. Grassland, woodland and peatland behave very differently, and peatland in particular has its own rules. - Be sceptical of any single study, including this one, that is presented as settling a large argument. This one adds a piece. It does not finish the picture.
What to know
Researchers at the University of Iceland at Holar compared sub-arctic grassland where livestock grazing had stopped with grassland still grazed. Soil organic carbon was lower where grazing had ceased, and long-term abandonment shifted the land towards vegetation that stored less carbon in the soil. The likely mechanism is root growth: grazing keeps grasses actively growing and pushing carbon underground. This does not make livestock climate-friendly overall, since it does not account for methane or wider farm emissions. It does show that the link between grazing and soil carbon is more complicated than usually assumed, at least in grassland. One study, one landscape. Useful, but not the last word. Sources: EurekAlert!/Wiley, "Does livestock grazing enhance or hinder soil carbon storage?", 23 September 2026, https://www.eurekalert.org/news-releases/1144631; Global Change Biology Communications, "Sustained Livestock Grazing Enhances Soil Organic Carbon Storage in Sub-Arctic Grassland", 23 September 2026, https://doi.org/10.1002/gcb4.70049 This article is for general information and does not replace advice from a doctor, pharmacist or other qualified healthcare professional.
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