Rewilding is more effective than conservation

What's this about?

People disagree about whether rewilding works better than usual ways to protect nature. Rewilding lets more natural forces shape land again.

What supporters say

• Rewilding can bring back grazers, hunters, and seed spreaders that help nature work.
• These animals can change plant life, make more homes for wildlife, and link food chains.
• It may cost less when soil, water, seeds, and natural change still work well.
• One project can help wildlife, trap carbon, and give people places to visit and enjoy.

What critics say

• No wide body of proof shows rewilding beats usual nature care in every place.
• Scientists use different meanings for rewilding, so they cannot easily compare studies.
• Badly harmed land may need planting, repair work, and long-term care before nature can recover.
• Usual care may work better when people need to save one rare animal or habitat.

The bottom line

Rewilding can help damaged land recover, especially when natural systems still remain. But we do not have proof that it works better than usual nature care overall.

Rewilding can help damaged landscapes recover, but the evidence does not show it is more effective than conventional conservation overall. Its value depends on the site, the goal and whether managers are trying to restore natural processes, save a particular species or protect a rare habitat.

The case for

Rewilding’s strongest appeal is its focus on restoring the natural forces that keep ecosystems working. Bringing back grazing animals, predators, seed dispersal or natural succession can reshape vegetation, improve habitat variety and strengthen food webs. In the right setting, this can rebuild ecological processes that have been lost through intensive farming, development or the removal of key species. 1

It can also be a less costly option in places where nature still has a fair chance to recover on its own. If soils, water systems, seed sources and natural disturbance patterns are largely intact, managers may avoid the expense of large-scale planting, repeated maintenance and intensive habitat work. But that advantage depends on the damage not being too severe. 2

A single rewilding project can potentially deliver several benefits at once: more wildlife, greater resilience to change, carbon storage, recreation and cultural value. At England’s Knepp estate, remote-sensing research found measurable changes in habitat structure under rewilding, offering a concrete example of ecological change across a large landscape (see Figure 3). 3

Supporters also argue that rewilding moves beyond treating conservation as the protection of individual species in isolated places. By restoring broader patterns of grazing, predation and vegetation change, it may create landscapes that are more varied and better able to adapt over time.

The case against

The central problem for the claim is that there is no broad evidence that rewilding beats conventional conservation in general. Research on the subject is still uneven: studies use different definitions of rewilding, measure different outcomes and cover different regions and ecosystems. This makes direct comparison difficult, and the available evidence is not evenly spread across conservation approaches or goals (see Figure 2). A successful case study can show that a project changed a landscape, but it cannot prove that the same approach is better than alternatives everywhere. 4

In heavily altered environments, simply stepping back may not be enough. Natural recovery can be blocked by depleted soils, damaged water systems, missing seeds or disrupted disturbance patterns. Reviews of restoration research find no universal winner between active and passive approaches, while active restoration has outperformed passive recovery in some dryland farming landscapes (see Figure 1). 5

Traditional conservation also remains vital for species and habitats that need focused protection. Protected areas, refuges and hands-on management can reduce threats and preserve the stable or specialist conditions that some rare species require. Such measures do not always work automatically: success depends on where protected areas are placed, how they are enforced, local governance and pressure from surrounding land use. But those limits do not make rewilding a universal replacement. 6

Rewilding can bring risks as well. Introducing non-native animals or stand-in species may restore some ecological roles, but it can also lead to invasions, disease, unexpected food-web changes and uncertain long-term effects. Projects may also face questions about animal welfare, land rights and who bears the costs. Local support, including among farmers, can depend on compensation, trust and whether a project fits with existing livelihoods. 7

The bottom line

Rewilding is a potentially effective tool, not a proven superior substitute for conservation. It may be especially useful where the aim is to restore landscape-scale processes, habitat diversity and resilience, and where natural recovery remains possible.

But other goals may call for other methods. Preventing a species extinction, maintaining a rare stable habitat or repairing severely damaged land may require protected areas, targeted species recovery and active restoration. The strongest approach is likely to combine these tools rather than assume that either reduced intervention or conventional management is always best.

This conclusion carries high confidence because it reflects several peer-reviewed reviews and meta-analyses. The main uncertainty is the shortage of long-term, standardized comparisons between rewilding and clearly defined conventional alternatives. Decisions should therefore be based on explicit ecological, social and cost goals at each site, with careful monitoring and adjustment over time.