Ever since modern environmentalism took off in the 1960s, people have tried to undo the damage humans have caused to nature. Efforts have ranged from reducing threats, to restoring habitats, to reintroducing vanished species – and the results have been mixed.

However, these efforts have helped shape modern conservation science. This branch of knowledge uses ecological, genetic and behavioural insights to guide smarter, more ethical conservation actions.

Governments often use this science to decide whether restoration projects should be approved. However, approval processes may be slow, under-resourced and complex, leaving passionate people feeling shut out.

In response, some have turned to “guerilla rewilding” without approval, and often without due consideration of the potential for unintended impacts. As a recent ABC investigation showed, these passionate souls may release species into the wild or build self-managed sanctuaries, often dismissing scientists as “purists”.

Rewilding aims to restore wildlife and natural processes to ecosystems where they’ve been lost, often due to land clearing, agriculture or other human activities.

It may involve reintroducing a species that has disappeared from a landscape, or using a similar surrogate species to revive lost ecological functions. The goal is to rebuild functioning, self-sustaining systems. It’s not just about individual species, but the roles they play in sustaining nature.

In Australia, rewilding typically takes place in

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