From Extinction to De-Extinction: Histories, Futures, and the Ethics of Reviving Lost Species

Overview

In this Royal Institution talk, the speaker traces how extinction became a familiar concept from early objections to species change to today’s ambitious de-extinction projects. The talk blends history, paleontology, and modern biotechnology to explore what it would mean to revive extinct species and how such efforts might reshape our relationship with life on Earth.

Key insights

• Origin of extinction as a present-day process, illustrated by Great Auk and passenger pigeon stories
• Cryopreservation and frozen tissue banks as insurance policies, not revival blueprints
• Ethical, economic, and governance debates about who decides which species get a second chance
• A call to reframe extinction as an issue of care and justice for all life

Introduction

The talk opens at Faraday's desk, framing extinction as a deeply familiar concept for many. The speaker situates the discussion historically, showing how naturalists and theologians once treated species as stable natural kinds, and how the idea of extinction was later reinforced by paleontological discoveries. The central pivot is the shift from extinction as a prehistoric inevitability to a current, ongoing process that might, with new technologies, be tempered or even reversed.

Early Concepts of Stability and Extinction

In the 18th and early 19th centuries, European and American naturalists often treated species as fixed, divine creations. The suggestion that species might change, evolve into new forms, or vanish was controversial, sometimes treated as atheistic or dangerous to the notion of a perfect natural order. When losses occurred, they were commonly attributed to human exploitation, and the language used reflected this, with terms like extirpation, eradication, or extermination. Even when a species seemed lost, naturalists tended to suppose it persisted somewhere awaiting discovery.

Deep Time and Human Antiquity

Geologists like Georges Cuvier provided evidence that some large animals, such as mammoths, were extinct. His anatomical comparisons helped convince the scientific world that the Earth once hosted ancient worlds populated by now-vanished creatures. This deep time frame also influenced ideas about human antiquity, leading to debates about when humans first appeared and how European civilizations were connected to the Stone Age peoples observed in other parts of the world. The talk emphasizes how these debates also carried troubling stereotypes about colonized peoples, reflecting a broader social context in which scientific theories often intersected with prejudicial beliefs.

The Great Auk, Dodo, and the Birth of Modern Extinction Thinking

As the 19th century progressed, naturalists began to view extinction as a real, ongoing process, not purely a prehistoric phenomenon. The great auk becomes a focal point: hunted to near-extinction for commercial purposes, its decline was rapid and shocking to contemporaries. The dodo and great auk sit in public imagination as icons of extinction, aided by literature that popularized them. The talk tracks how early conservation ideas emerged here, with some naturalists arguing for protective legislation to shield vulnerable populations from human exploitation.

Conservation Emerges, Then Expands

Hunters and collectors were among the first to raise warnings about wildlife decline. The American bison nearly vanished in the 19th century, but concerted conservation actions, including protected sanctuaries and breeding programs, eventually allowed populations to recover. Other species, such as the passenger pigeon, collapsed despite warnings, illustrating the limits of early protective efforts and the powerful role of human activity in driving extinction. The talk underscores that conservation history is a story of imperfect responses and evolving strategies, not a single turning point.

Enter Frozen Arks and Cryopreservation

With the turn of the 20th century, new technologies—cryopreservation and frozen tissue banks—reframed what might be possible for conservation and revival. The talk traces the origins of cryopreservation science, its early applications in animal breeding, and the establishment of large tissue banks like the Frozen Zoo. These “frozen arks” preserve genetic material as insurance against future loss, raising profound questions about whether preserved material constitutes life revived or merely preserved, dormant potential.

De-extinction: Potentials and Pitfalls

The Pyrenean ibex case study illustrates both the promise and the limits of de-extinction technologies. Cloning attempts yielded a single kid that did not survive due to a fatal lung defect, highlighting the technical and ecological challenges of reviving an extinct organism. The talk discusses whether revived animals would be ecologically functional or merely genetic echoes of a past phenotype. It also probes whether the very act of revival could be considered a new form of extinction if the revived organism cannot fulfill the same ecological role as its ancestor.

Ethical, Economic, and Governance Debates

The talk surveys the intense debates surrounding de-extinction. Critics worry that revivals could divert resources from protecting living species and habitats, while proponents argue that genetic erasure or regeneration could restore ecosystem functions or genetic diversity. The role of private funding, the influence of wealth, and questions about democratic oversight are discussed, alongside IUCN policy developments that increasingly regulate synthetic biology and gene editing. The question of what future we are consciously building becomes central to the discourse.

Visions of the Future: Justice, Kinship, and Responsibility

The speaker argues for reframing our approach to extinction away from domination and toward care, reciprocity, and justice for all life. The possibility of reviving megafauna like mammoths is discussed not only as ecological engineering but also as a test case for societal values: who has the power to decide which species are given a second chance, and what responsibilities accompany that power? The talk closes with a call to cultivate relationships with all life as kin, resisting the idea that technology alone will solve the biodiversity crisis.

Conclusion

Extinction is both a scientific and a political concept. Even as de-extinction technologies advance, the Biodiversity Crisis requires changing human behavior and governance. The message is clear: better relationships with living beings, rather than reliance on genome rescue, offer the most promising path to a world where extinction is less likely and life in all its forms can flourish.