Q.Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?

Yes — a defensible situation is when a species poses a severe, direct threat to human life with no offsetting ecological role, and every other control measure has failed. The clearest real case is the smallpox virus: it existed only as a human pathogen, had no known ecological function, and its global eradication (declared in 1980) saved countless future lives at no ecological cost. This chapter does not name this example itself — it is general knowledge, not a textbook quote — but the reasoning it supports fits squarely within the chapter's own ethical framing of conservation. …

The idea of deliberately driving a species to extinction feels deeply unsettling. After all, we are taught that every species has a role in the web of life, and that biodiversity is worth preserving. Yet there are rare, extreme situations where humans have considered — and even attempted — the complete eradication of a species. The most famous example is the smallpox virus. Through a global vaccination campaign, smallpox was declared eradicated in 1980. The justification was straightforward: smallpox killed millions of people, caused immense suffering, and existed only in humans, so wiping it out meant saving countless future lives with no ecological downside. This is the clearest case where extinction was not just acceptable but a moral imperative.

Another situation involves invasive species that devastate native ecosystems or agriculture. Imagine a predatory snake introduced to an island that has no natural predators and proceeds to eat every native bird, lizard, and small mammal. If that snake also threatens human food supplies or spreads disease, conservationists might consider a targeted eradication program. The goal is not to make the snake extinct globally — that would be impossible — but to eliminate it from that specific ecosystem. However, if the snake exists only on that island, then local extinction equals global extinction. This is a heavy decision, because once a species is gone, it is gone forever.

The justification for deliberate extinction rests on a few key principles. First, the species must pose a direct, severe, and irreversible threat to human life or well-being — like a pathogen that causes a deadly disease with no cure. Second, the species must have no critical ecological function that would collapse if it disappeared. Smallpox, for instance, had no known role in any ecosystem; it was purely a parasite on humans. Third, all other methods of control — vaccines, medicines, quarantine, biological control — must have failed or be impossible. Finally, the decision must be made with scientific consensus and public accountability, not by a single government or corporation.

This is an open reasoning question, so structure the answer as a conditional test rather than a single example: state the criteria that would make deliberate extinction justifiable (severe, irreversible threat to humans; no critical ecological role for the species; all other controls exhausted) and only then ap …