Sustainability Language

Biodiversity & Nature

De-extinction

Attempts to create functional proxies of extinct species through back-breeding, cloning or genome engineering — guided by IUCN principles and contested in conservation.

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Definition

De-extinction refers to efforts to produce organisms that resemble or functionally replace extinct species, via three pathways identified by the IUCN Species Survival Commission's 2016 Guiding Principles on Creating Proxies of Extinct Species: selective back-breeding, cloning, and genome engineering. The products are proxies — ecological analogues — rather than exact recreations of the lost species.

References

Aeon

2025 developments and IUCN WCC context

Overview

What it means

Using biotechnology to restore ecological functions lost with extinct species, while accepting that what returns is a proxy, not the original.

How it is used

Projects such as efforts around the woolly mammoth and the 2025 Colossal Biosciences "dire wolf" announcement have made the field prominent; the IUCN World Conservation Congress (Abu Dhabi 2025) addressed synthetic-biology policy in this context.

**Note:** De-extinction is contested: critics argue it diverts resources from preventing extinction and creates moral hazard; proponents frame proxies as tools for restoring ecosystem functions. The term should be read as covering proxies, not literal resurrection.

Why it matters

De-extinction forces conservation to define what recovery means in the genomic age, with real governance consequences for biodiversity policy.

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