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Environmental ethics is the branch of philosophy that examines moral questions about the natural world and humanity’s relationship to it. It asks what, if anything, humans owe to non-human entities—animals, plants, ecosystems, species, and the Earth itself—and what principles should guide human action toward the environment. Unlike applied ethics fields that focus on interpersonal duties, environmental ethics treats the non-human world as a possible subject of moral standing, not merely as a resource for human use.
The field is organized around a cluster of foundational questions. The most basic is: what has moral standing? That is, which entities matter morally for their own sake, and which matter only because they serve the interests of beings who matter? A second question concerns the content of our duties: even if a forest or a river has moral standing, what exactly do we owe it? A third concerns how to weigh competing values: when human economic development conflicts with the preservation of a species or an ecosystem, how should the trade-off be assessed? A fourth, more recent question asks whether the environment itself—as a system or a whole—can be the bearer of rights or the object of duties, rather than only its individual parts.
The stakes are practical as well as theoretical. Environmental policies, land management decisions, conservation priorities, and climate agreements all presuppose answers to these questions, whether explicitly or implicitly. If only humans have moral standing, then environmental protection is a matter of prudence or aesthetics—protecting resources for future generations or preserving beauty for human enjoyment. If non-human entities have intrinsic value, then environmental harm is a moral wrong in itself, independent of its effects on people. The field thus provides the normative framework for much of environmental law, policy, and activism.
Environmental ethics emerged as a distinct philosophical subfield in the 1970s, largely in response to the rise of the modern environmental movement. The term itself was not used by earlier thinkers, and the field’s precursors should be understood in their own terms. Several older traditions contributed ideas that later environmental ethicists drew upon, but these precursors were not engaged in environmental ethics as a self-conscious discipline.
The most important precursor is the conservation tradition of the late nineteenth and early twentieth centuries, represented by figures such as John Muir and Gifford Pinchot. Muir argued for the preservation of wilderness for its own sake, often in quasi-spiritual terms, while Pinchot advocated for the wise use of natural resources for the greatest good of the greatest number over the long term. Their disagreement—preservation versus conservation—prefigured later debates about intrinsic versus instrumental value, but neither framed the issue in explicitly philosophical terms.
Another precursor is the tradition of American transcendentalism, particularly the writings of Henry David Thoreau and Ralph Waldo Emerson, which celebrated nature as a source of spiritual and moral insight. This tradition influenced later environmental thinking but did not develop a systematic ethical theory.
A third precursor is the animal welfare movement, which argued against cruelty to animals on utilitarian or sentimental grounds. Thinkers such as Jeremy Bentham in the eighteenth century and later animal advocates raised questions about the moral status of non-human animals, but they focused on sentient beings, not on ecosystems or species, and they did not frame their concerns as environmental.
The immediate intellectual context for the field’s emergence was the publication of several influential essays in the early 1970s. Lynn White Jr.’s 1967 essay “The Historical Roots of Our Ecologic Crisis” argued that the Judeo-Christian tradition, with its doctrine of human dominion over nature, bore significant responsibility for environmental degradation. This essay provoked philosophical responses and helped establish the field’s critical stance toward traditional Western ethics. In 1973, the Norwegian philosopher Arne Naess published “The Shallow and the Deep, Long-Range Ecology Movement,” which distinguished between shallow environmentalism (concerned with pollution and resource depletion for human benefit) and deep ecology (concerned with the intrinsic value of all living beings). These essays, along with the founding of the journal Environmental Ethics in 1979, marked the consolidation of the field.
The field is best understood through several rival approaches that emerged in its first decades and continue to structure its debates. These approaches are not mutually exclusive, and many contemporary environmental ethicists combine elements from more than one. They are best seen as competing research programmes, each addressing the same foundational questions with different assumptions.
Anthropocentrism holds that only human beings have intrinsic moral standing; non-human entities have value only insofar as they serve human interests. This view does not necessarily license environmental destruction. A sophisticated anthropocentrist can argue for strong environmental protection on the grounds that humans depend on healthy ecosystems for survival, that future generations have rights that impose duties on the present, and that natural beauty has aesthetic value that enriches human life. The distinctive feature of anthropocentrism is that all these reasons ultimately appeal to human welfare or human values.
The strength of anthropocentrism is its philosophical economy: it requires no extension of moral standing beyond the human community, and it aligns with common-sense intuitions about moral responsibility. Its weakness is that it seems unable to capture the intuition that some environmental harms are wrong even when no human interest is clearly harmed—for example, the extinction of a species that has no known human use. Critics also argue that anthropocentrism is arbitrary, singling out one species for special moral consideration without a principled justification.
Individualist approaches extend moral standing to individual non-human beings, but they differ on the basis for that extension. Utilitarian environmental ethicists, following Peter Singer’s work on animal liberation, argue that the capacity to suffer is the criterion for moral standing. On this view, all sentient beings—beings capable of experiencing pleasure and pain—deserve moral consideration, and the right action is the one that maximizes overall well-being across all sentient beings. This approach is powerful because it provides a clear, empirically grounded criterion for moral standing and a method for weighing competing interests.
Rights-based approaches, following Tom Regan’s work, argue that certain non-human animals have inherent value and therefore rights that cannot be overridden merely because doing so would produce better consequences. Regan argued that animals that are “subjects-of-a-life”—beings with beliefs, desires, perception, memory, and a sense of their own future—have the same basic moral rights as humans, including the right not to be harmed.
Both individualist approaches face a common problem: they have difficulty accounting for the moral significance of wholes—species, ecosystems, and biodiversity. A species is not an individual sentient being, and an ecosystem is not a subject-of-a-life. If only individuals have moral standing, then the extinction of a species matters only because of the suffering or loss of the individuals involved, not because the species itself has value. Many environmental ethicists have found this implication counterintuitive, arguing that we value species and ecosystems in ways that cannot be reduced to the value of their individual members.
Holist approaches assign moral standing to wholes—ecosystems, species, or the biosphere itself—rather than only to individuals. The two most influential holist positions are deep ecology and the land ethic.
Deep ecology, developed by Arne Naess and elaborated by others, holds that all living beings have intrinsic value independent of their usefulness to humans, and that humans are part of the natural world, not separate from it. Deep ecologists advocate for a radical reduction in human population and consumption, and for the preservation of wilderness and biodiversity as ends in themselves. The approach is explicitly spiritual and philosophical, drawing on traditions such as Buddhism and Native American thought, and it rejects the idea that environmental problems can be solved by technological fixes or economic incentives alone.
The land ethic, articulated by Aldo Leopold in his 1949 book A Sand County Almanac, extends moral consideration to the land community as a whole. Leopold’s famous maxim—“A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends otherwise”—treats the ecosystem, not the individual, as the primary object of moral concern. The land ethic is often described as an extension of the ethical community from humans to include soils, waters, plants, and animals.
Holist approaches have been criticized on several grounds. Individualist ethicists argue that holism can justify sacrificing individual interests for the sake of the whole, a position that seems to license morally unacceptable trade-offs—for example, allowing individual animals to suffer or die for the sake of ecosystem health. Holists respond that this objection misunderstands their position: the land ethic does not require ignoring individual welfare, but it does hold that the health of the community is a primary value that cannot be reduced to the sum of individual interests. The debate between individualist and holist approaches remains one of the most vigorous in the field.
Ecofeminism, which emerged in the 1980s, argues that the domination of nature and the domination of women are interconnected, sharing the same underlying logic of oppression. Ecofeminists contend that Western culture has historically associated women with nature and men with culture, and that the devaluation of nature has been intertwined with the devaluation of women. Environmental ethics, on this view, cannot be separated from questions of gender justice, and any adequate environmental ethic must address the ways in which environmental degradation disproportionately harms women and other marginalized groups.
Ecofeminism is not a single doctrine but a family of positions. Some ecofeminists emphasize the spiritual connection between women and nature, while others focus on the material conditions of women’s lives in relation to environmental resources. The approach has been influential in drawing attention to the social dimensions of environmental problems and in challenging the abstraction of much mainstream environmental ethics. Critics have argued that ecofeminism risks essentializing women—treating them as naturally closer to nature—and that its focus on gender can obscure other axes of oppression, such as race and class.
A more recent tendency in environmental ethics is pragmatism, which draws on the American philosophical tradition of William James and John Dewey. Pragmatist environmental ethicists argue that the field has become too focused on abstract theoretical debates about moral standing and intrinsic value, and that it should instead focus on practical problems and the resolution of concrete environmental conflicts. On this view, environmental ethics should be pluralistic, drawing on whatever values and arguments are useful in a given situation, rather than insisting on a single overarching theory.
Pragmatism has been influential in moving the field toward engagement with environmental policy, environmental justice, and the concerns of local communities. It has also been criticized for being insufficiently principled—for abandoning the search for a coherent ethical foundation in favor of ad hoc problem-solving.
Contemporary environmental ethics is characterized by several developments that have reshaped the field since its early decades.
One major development is the rise of environmental justice as a central concern. Environmental justice, which emerged from grassroots movements in the 1980s, focuses on the disproportionate environmental burdens borne by poor and minority communities—such as exposure to pollution, lack of access to clean water, and vulnerability to climate change. This movement has challenged environmental ethics to attend to questions of distribution and equity, not only to questions of intrinsic value. Many environmental ethicists now argue that environmental justice is not a separate issue but is integral to any adequate environmental ethic.
A second development is the growing attention to climate ethics. Climate change raises distinctive moral questions that do not fit neatly into the frameworks developed for wilderness preservation or animal welfare. These questions include the distribution of responsibility for emissions, the rights of future generations, the obligations of wealthy nations to poor nations, and the ethics of geoengineering. Climate ethics has become one of the most active areas of the field, drawing on both anthropocentric and non-anthropocentric frameworks.
A third development is the increasing engagement with non-Western philosophical traditions. Early environmental ethics was dominated by Western thinkers and Western frameworks, but the field has become more global. Scholars have drawn on Buddhist, Daoist, Indigenous, and African philosophical traditions to develop alternative environmental ethics. Indigenous environmental thought, in particular, has gained prominence, with its emphasis on relationality, reciprocity, and the moral standing of the land itself. This engagement has enriched the field but has also raised questions about cultural appropriation and the difficulty of translating concepts across traditions.
A fourth development is the debate over the Anthropocene—the proposed geological epoch in which human activity has become a dominant force shaping the Earth system. Some environmental ethicists argue that the Anthropocene concept undermines the traditional distinction between nature and culture, and that environmental ethics must move beyond preservationist frameworks toward an ethic of responsible stewardship of a human-dominated planet. Others argue that the Anthropocene concept is politically dangerous, as it can be used to justify further human intervention in nature. This debate reflects a deeper tension in the field between preservationist and interventionist approaches.
The field today is pluralistic and contested. No single approach has achieved dominance, and the major debates of the 1970s and 1980s—between anthropocentrism and non-anthropocentrism, between individualism and holism—remain unresolved. At the same time, the field has become more practically engaged, more attentive to social justice, and more open to diverse philosophical traditions. Environmental ethics is not a settled body of doctrine but an ongoing conversation about the moral dimensions of humanity’s relationship to the natural world.