Rewilding projects can restore natural ecological processes, increase biodiversity and strengthen ecosystem resilience. However, their success may be limited by land-use conflict, cost, uncertain ecological outcomes and opposition from affected communities.
This is HL-only content in IB ESS subtopic 3.3, Conservation and regeneration, although the basic concept of rewilding is studied at both SL and HL.
Rewilding aims to regenerate natural ecosystem processes, often by reducing human management, restoring habitats or reintroducing missing species. Reintroducing a keystone species can alter interactions across several trophic levels, potentially producing a trophic cascade and positive feedback that supports biodiversity.
| Benefits | Limitations |
|---|---|
| Restores natural processes such as predation, grazing and succession | Ecological responses are complex, uncertain and difficult to predict |
| Increases habitat and species diversity, improving ecosystem resilience | Reintroduced species may create conflict with farmers through livestock predation or crop damage |
| Can reconnect fragmented habitats and support gene flow | Large connected areas may be unavailable or expensive to secure |
| May restore ecosystem services, including carbon storage, flood regulation and ecotourism income | Benefits may take decades to appear, while monitoring and compensation create continuing costs |
| Reduces the need for intensive long-term human management | Projects may exclude local or Indigenous communities, creating environmental justice concerns |
A named example is the reintroduction of grey wolves to Yellowstone National Park, USA, beginning in 1995. Wolves reduced and redistributed elk grazing pressure, supporting vegetation recovery and providing habitats for other species. However, attributing every ecosystem change to wolves alone oversimplifies a system also affected by climate, hydrology and other predators.
The common misconception is that rewilding means leaving nature completely untouched. In practice, it may require active intervention, monitoring and stakeholder management.
For an IB ESS evaluate question, present both benefits and limitations, use a named example, consider contrasting ecocentric and anthropocentric perspectives, and finish with a supported judgement. A strong conclusion should state that rewilding is most effective where ecological evidence, sufficient space and equitable community participation are combined.
