A new push to release millions of sterile male mosquitoes in the U.S. is framed as a public-health tool to curb malaria-linked transmission—yet a researcher at the Hastings Center for Bioethics argues the question of whether to erase an entire species is one t
A summer night can feel effortless—until the buzzing starts and you’re suddenly counting bites. But for scientists working on mosquito-borne disease, the question isn’t just whether mosquitoes are annoying. It’s whether they’re controllable without crossing a line that many people instinctively resist: wiping a species from the planet.
That tension is playing out in discussions about what comes next in the fight against mosquitoes. Under Google’s Debug program. the idea recently reached the Environmental Protection Agency: permission to release more than 30 million sterile male mosquitoes in Florida and California. The goal is simple to state and harder to accept—shrink the mosquito population by limiting reproduction.
The public-health promise is tied to illnesses mosquitoes spread, including Zika and dengue. But the proposal also brings a bigger, older question to the surface: if science can reduce mosquitoes, why not eliminate them altogether—and should anyone even want that?
Greg Kaebnick. a research scholar at the Hastings Center for Bioethics. took that issue to a National Academies of Sciences discussion. He described gathering environmental ethicists. conservation biologists. and ecologists to wrestle with a single. blunt problem: whether it would ever be okay to wipe out a species. Kaebnick said. “We got together a group of environmental ethicists. conservation biologists. and ecologists to think about this question: Would it be okay ever to wipe out a species?” He added. “We brought together folks like me [who are] predisposed to try to protect species. But we were persuaded that sometimes the case could be made.”.
The moral debate quickly runs into the practical one. Kaebnick said he hasn’t seen a research effort trying to get rid of all mosquitoes. “There’s nobody doing research on these technologies or looking at the diseases who’s saying let’s get rid of all mosquitoes,” he said.
He pointed to difficulty first. Getting rid of every mosquito would be “phenomenally difficult.” And even the researchers focused on disease prevention aren’t aiming at erasing the insect itself. Kaebnick described malaria this way: the mosquito is a vector—part of the lifecycle of plasmodium. the single-cell microbe that enters the bloodstream and causes malaria. “You can get rid of malaria by getting rid of plasmodium. You don’t have to get rid of the mosquito,” he said.
That distinction matters to the ethics of intervention. Kaebnick said researchers involved in targeting transmission are “pretty careful to say ‘We’re not targeting the mosquito, but absolutely we’re getting rid of plasmodium.’” He said he hasn’t heard people mourn the possible loss of plasmodium.
Still, the question keeps coming back: how far should people go to end suffering?
Kaebnick compared the challenge of eliminating malaria to a hard, long project. He said it was a “huge undertaking” in the United States. backed by an effort funded by the Rockefeller Foundation that created a large center in Atlanta—an approach aimed at the southern United States where malaria was a major problem. He said that organization later was given to the federal government and turned into the CDC.
That work. Kaebnick said. relied on more than one lever: pesticides to kill mosquitoes. habitat change that included draining swamps. and clinical care. The idea was to interrupt the lifecycle: if a person infected with plasmodium has to be bitten by a mosquito for the lifecycle to continue. then reducing bites helps reduce transmission. Kaebnick said that putting a sick person in a bedroom with screens can help get rid of plasmodium on its own. “It was a combination of a whole lot of things like this that allowed us to get rid of it. ” he said.
Where the moral argument sharpens is when elimination moves from a microbe to a species. Kaebnick described a stance the group leaned toward for Anopheles gambiae—a mosquito species complex that spreads malaria. “That’s essentially where we came down in Anopheles gambiae [species complex],” he said. He argued it’s a “really pretty horrific” one and that there are about 800 species of mosquito in Africa. He said the group believed Anopheles gambiae could be eliminated across sub-Saharan Africa with “little to no environmental impact from losing it.”.
But not all mosquito elimination would look the same, Kaebnick said. Some mosquitoes spread around the world are not native. meaning removing them might not disrupt a natural system in the same way. “Then there are other kinds of mosquitoes that have been spread around the world. They’re not native. and so you’re not necessarily changing a natural system if you get rid of them. ” he said.
That brings the conversation to uncertainty—something that becomes unavoidable when ethics meets biology. Kaebnick acknowledged there’s no absolute certainty. When asked how people know for sure. he said. “You don’t know for sure.” He then shifted to a question he says matters just as much: whether people can live with uncertainty when lives are on the line. “The question is, ‘Well, do you need to know for sure?. How do you feel about the level of uncertainty here?’” he said.
He offered a vivid comparison: if you’re in a burning building and must jump to the ground, you don’t necessarily know you’ll survive—yet you jump because the alternative is staying. “Malaria is a little bit like that,” he said.
For Kaebnick, the ethics don’t sit only in academic talk. He described being on the move in nature—canoe camping in the Adirondacks—where mosquitoes and biting black flies can make it “pretty tough.” He said he understands the misery of being bitten. But he also rejected the idea of erasing everything. “I would not want to get rid of all of the species of mosquito and biting black fly up there. ” he said. “It’s part of the whole system and I want to leave it alone.”.
He connected that reluctance to a wider value in the natural world and to how Americans already treat conservation. Kaebnick pointed to the Endangered Species Act as a landmark policy accomplishment of the 20th century. “Wild species are a marker of the value of the natural world. and it feels like a particularly awful thing to do to get rid of a species. ” he said. For any argument that a species should be eliminated, he said it would need to be “really quite strong.”.
The debate doesn’t end with mosquito bites or even with the mechanics of releasing sterile males. It ends up pressing into a sharper question: when public-health goals collide with the moral weight of biodiversity. what level of risk. uncertainty. and loss are people willing to accept—and how many “no’s” have to be overcome before the answer can be called progress.
Kaebnick’s comments came during an episode of Explain It to Me. Vox’s weekly call-in podcast. where he also addressed questions about what to do about mosquito bites people still experience. The conversation was edited for length and clarity, with the full episode available through Apple Podcasts and Spotify. Listeners were also invited to submit questions by email at askvox@vox.com or by calling 1-800-618-8545.
mosquitoes malaria Zika dengue sterile male mosquitoes Environmental Protection Agency Google Debug CDC Endangered Species Act bioethics Hastings Center for Bioethics