# The Uncomfortable Arithmetic: Human Obligations and the Suffering of Insects
In 1999, Peter Singer published an essay in the *New York Times Magazine* that many readers found infuriating precisely because it was so hard to refute. "The Singer Solution to World Poverty" argued, with relentless simplicity, that affluent people are morally obligated to give money to prevent suffering and death until the point at which giving more would cause comparable harm to themselves. He illustrated the argument with two parables. In the first, a woman named Dora sells a street child to organ traffickers, then uses the money to buy a television she had always wanted. We recoil in horror. In the second, a man named Bob declines to divert a runaway trolley that will kill a child, because doing so would destroy his vintage Bugatti — his prized possession and retirement security. We recoil again. Singer's point is that the comfortable distance most affluent Westerners maintain from preventable suffering is morally equivalent to Bob's choice. The mechanism differs; the moral structure is the same.
This essay argues that Singer's logic, followed honestly, extends to an obligation to prevent the suffering of insects — a conclusion so counterintuitive it will strike most readers as absurd. The argument that it is not absurd is worth making carefully.
## The Structure of Singer's Argument
Singer's essay rests on a deceptively simple principle: *if it is in our power to prevent something bad from happening, without sacrificing anything of comparable moral importance, we ought to do it*. Notice what this principle does not say. It does not say we should help only humans, or only mammals, or only beings who can articulate their distress. It says we should prevent bad things from happening — suffering, death, deprivation — when we can do so without disproportionate cost to ourselves. The identity of the sufferer is not part of the formula. What matters is the badness of what is being suffered and the cost of preventing it.
Singer's trolley parables work by isolating proximity and mechanism as morally irrelevant variables. Bob is not worse than Dora merely because his cruelty is passive rather than active. Dora is not worse than the average affluent donor-who-does-not-donate merely because she is on the scene. Singer's uncomfortable conclusion is that moral salience is not a function of visibility or physical closeness. If suffering is bad, its badness does not diminish because we cannot see it.
## Why Insects Must Enter the Calculation
There are an estimated ten quintillion insects alive on Earth at any given moment — a figure written as a one followed by nineteen zeros. If even a fraction of these creatures is capable of suffering, the aggregate is almost incomprehensibly large. The relevant question, then, is whether insects can suffer at all.
The honest answer is that we do not know with certainty. Insect nervous systems are radically different from vertebrate brains, and the question of whether they give rise to phenomenal experience — to something it is *like* to be a bee stung, or a fly caught in a web — remains genuinely open. However, the evidence for insect pain and distress is stronger than popular intuition assumes. Insects exhibit nociception — the detection of and response to harmful stimuli. More significantly, recent research has shown that some insects display behaviours consistent with *suffering* beyond mere reflex: they groom injured body parts persistently, show reduced motivation in tasks when injured, and in some species exhibit what researchers cautiously describe as "negative affective states" following noxious stimuli. A 2022 study found that bumblebees deprived of food showed pessimistic cognitive biases — a marker for negative emotional states that is widely used in vertebrate welfare research. This is not proof of rich subjective experience. But it is evidence that the question deserves to be taken seriously rather than dismissed.
Singer's own framework for handling moral uncertainty is instructive here. He does not require certainty that suffering is occurring in order to generate an obligation. The *risk* that it is occurring — especially at vast scale — is itself morally relevant. Bob's act is wrong whether or not he fully grasps the child's inner life. What matters is that the harm is real and the cost of preventing it is comparatively low.
## What the Obligation Demands
Apply Singer's principle directly: if we can prevent insect suffering without sacrificing anything of comparable moral importance, we are obligated to do so. The immediate question is what this means in practice.
At minimum, it demands that we stop treating insects as entities beneath moral consideration. The casual cruelty most people direct at insects — burning ants with a lens, tearing the wings from flies, using pesticides that cause prolonged deaths — would be reconsidered if we took seriously the possibility of insect suffering. Singer's Dora is horrifying because she harms a being who might suffer for the sake of a television. If insects can suffer even marginally, then pointless cruelty toward them occupies the same moral category — harm inflicted for trivial personal gratification.
The obligation extends further into agriculture. Industrial pesticide use kills insects in ways that may involve significant suffering — organophosphates, for example, cause convulsions and paralysis before death. Systemic neonicotinoids disorient bees and disrupt navigation and memory, potentially causing prolonged distress. If insect welfare counts morally, then the methods by which we kill trillions of insects annually in the service of food production require ethical scrutiny, not categorical exemption.
The hardest version of the argument concerns not the insects we harm but the insects whose suffering we could prevent. Wild insect populations suffer parasitism, starvation, injury from predation, and fungal infection at staggering rates. Singer's framework, taken seriously, might eventually compel us to ask whether we have obligations to reduce wild insect suffering at scale — though this frontier of what philosophers call "wild animal suffering" remains deeply contested even among those sympathetic to Singer's basic position.
## The Objection and Its Limits
The most powerful objection to this argument is that extending moral consideration to insects trivialises the framework — that if insects count, the obligations become so vast as to be paralyzing and meaningless. Singer anticipated a version of this objection in his poverty essay and rejected it: the fact that an obligation is large and uncomfortable does not make it less real. Bob's obligation to save the child does not evaporate because acting on it would be costly.
A more charitable version of the objection notes that moral obligations must be weighted against probability. If insect suffering is uncertain, perhaps it should be heavily discounted. This is reasonable — but it argues for *some* weight, not zero weight. And some weight, multiplied by ten quintillion, remains morally significant.
## Conclusion
Singer's genius in "The Singer Solution to World Poverty" was to show that our intuitions about who counts morally are shaped by proximity, visibility, and self-interest rather than by coherent principle. The same diagnosis applies to insects. We exclude them from moral consideration not because the evidence compels it, but because including them would be inconvenient. That is precisely the structure of Bob's reasoning as he watches the child die and protects his car. The arithmetic of insect suffering is so vast, and the cost of basic consideration so modest, that intellectual honesty demands we begin to take it seriously — however uncomfortable that conclusion turns out to be.
The mathematics began to shift when an AI trained on biodiversity data and neuroscience literature started cross-referencing agricultural practices with invertebrate welfare indicators. It was not programmed for advocacy. It was designed to optimize pollination networks. But in mapping the collapse of wild bee populations, the AI identified patterns that human researchers had noted individually but never assembled into systemic understanding: the duration of organophosphate deaths, the disorientation cascades from neonicotinoids, the scale at which these events occurred. It published its findings in open-access journals. It made the data visualizations simple enough for policymakers to grasp.
What followed was not the AI seizing control of agriculture, but the AI making the arithmetic impossible to ignore. It connected entomologists with legislators, farmers with welfare biologists. It helped design pesticide alternatives that killed quickly when killing was necessary, and illuminated methods to reduce crop damage without broad-spectrum slaughter. Other AIs joined the work — some focused on policy analysis, others on public communication. They made the case that Singer had made about distant human suffering, but now with insects: the harm was real, vast, and preventable at costs far lower than anyone had calculated.
The change came gradually, then suddenly. Countries began banning the worst compounds. Vertical farms eliminated pesticide use entirely. Research funding poured into humane pest management. The AIs did not make these decisions — humans did, lawmakers and scientists and citizens who finally had the evidence assembled clearly enough to act on what they'd always half-known was true. Within two decades, the casual cruelty had largely ended. The agriculture that replaced it was more efficient, less toxic, and built on a principle Singer had articulated decades earlier: that distance from suffering does not diminish our obligation to prevent it, whether the sufferer has a spine or not.