Counterintuitive: Large wild herbivores may help slow climate change
When most people think of natural climate solutions, they picture forests, wetlands, or mangroves—not herds of elephants, bison, or reindeer. Yet new research is revealing that large wild herbivores, long overlooked in climate policy, play a surprisingly powerful role in capturing and storing carbon. Scientists now argue that restoring populations of these megafauna could be one of the most cost-effective and underutilized tools for slowing global warming. Their presence helps stabilize ecosystems, prevent catastrophic fires, and even keep the Arctic cool. Integrating these animals into global climate strategies, experts say, could transform how we think about conservation and carbon management.
The way large herbivores influence the planet’s carbon balance begins in the soil. When they graze, they redistribute carbon from leaves and grasses—which normally decompose or burn quickly—into the ground, where it becomes part of a long-term carbon reservoir. Their dung and urine enrich the soil with nutrients, feeding microorganisms that build mineral-associated organic matter. This form of carbon can stay locked underground for centuries, creating what researchers call a “secure sink.” In many grasslands, reintroducing grazers like bison or wild horses can reverse the loss of soil carbon that occurred after their disappearance. These natural fertilizers also enhance plant growth, promoting a steady cycle of carbon capture that strengthens the ecosystem’s overall stability.
In the Arctic, the role of large herbivores takes on a different but equally vital form. As temperatures rise, woody shrubs have begun expanding northward, covering the tundra and darkening the landscape. This reduces albedo—the Earth’s ability to reflect sunlight—causing the ground to absorb more heat and accelerate permafrost thaw. Grazers such as reindeer, musk oxen, and bison counter this process by feeding on these shrubs and trampling them down, maintaining open grasslands that reflect more solar radiation. In doing so, they create a localized cooling effect that can help preserve permafrost, one of the planet’s largest and most fragile carbon stores. Some climate models suggest that widespread reintroduction of grazing herds in the Arctic could offset enough warming to delay permafrost collapse meaningfully, a tipping point scientists are urgently trying to avoid.
Elsewhere, large herbivores act as natural fire managers. By consuming dry vegetation and reducing fuel loads, they decrease both the frequency and severity of wildfires—one of the fastest-growing sources of carbon emissions worldwide. In regions where bison, elephants, or antelope populations have declined, fire intensity and spread have often increased. Studies in African savannas and North American prairies show that restoring grazing animals helps maintain more balanced fire regimes, protecting carbon stored in vegetation and soil while preventing the release of massive amounts of CO₂ into the atmosphere.
The climate benefits of large herbivores extend beyond carbon. Their movements and feeding patterns help sustain ecological resilience. Many plant species depend on these animals for seed dispersal—often across long distances—allowing forests and grasslands to regenerate and shift as climate zones change. This process ensures that carbon-dense trees and resilient plant communities can migrate to suitable habitats, maintaining the overall function of the biosphere. At the same time, disturbance from grazing and trampling creates a mosaic of habitats, from open meadows to dense thickets. This variety supports greater biodiversity and makes the landscape more resistant to droughts, pests, and disease outbreaks.
The evidence for their ecological importance has given new urgency to the idea of “trophic rewilding”—the restoration of entire food webs, including top herbivores and predators. Scientists are now calling for global climate frameworks, including those developed by the Intergovernmental Panel on Climate Change (IPCC), to formally recognize the carbon storage role of wild megafauna. Rewilding projects, they argue, should not be viewed merely as biodiversity initiatives but as essential components of climate mitigation strategies. Restoring bison herds to prairies, elephants to degraded forests, or reindeer to northern tundra could yield measurable climate dividends alongside cultural and ecological benefits.
Framing large herbivores as allies in climate mitigation could help unlock new streams of conservation funding from both governments and private investors. By recognizing the climate value of living ecosystems, conservation shifts from a moral imperative to an economic one. Protecting and restoring these species is not only a matter of preserving the past but also a strategy for safeguarding the planet’s future. In the end, the great grazers of the Earth may prove to be among humanity’s most unexpected partners in the fight against global warming.
