About Arne Næss
Lived 1912 – 2009 (aged 96). Arne Næss was a Norwegian philosopher, professor, mountaineer, writer and environmentalist.
Arne Dekke Eide Næss ( ; ; 27 January 1912 – 12 January 2009) was a Norwegian philosopher who coined the term "deep ecology", an important intellectual and inspirational figure within the environmental movement of the late twentieth century, and a prolific writer on many other philosophical issues. Næss cited Rachel Carson's 1962 book Silent Spring as being a key influence in his vision of deep ecology. Næss combined his ecological vision with Gandhian nonviolence and on several occasions participated in direct action.
Næss averred that while western environmental groups of the early post–World War II period had raised public awareness of the environmental issues of the time, they had largely failed to have insight into and address what he argued were the underlying cultural and philosophical background to these problems. Næss believed that the environmental crisis of the twentieth century had arisen due to certain unspoken philosophical presuppositions and attitudes within modern western developed societies which remained unacknowledged.
Life and career Næss was born in Slemdal, Oslo, Norway, the son of Christine (Dekke) and Ragnar Eide Næss. Ragnar was a successful banker, and Arne was the younger brother of shipowner Erling Dekke Næss. Næss had two children with his first wife Else and was the uncle of mountaineer and businessman Arne Næss Jr. (1937–2004).
When he was 61, while guest-lecturing at the University of Hong Kong, he met Kit-Fai Tsui, a philosophy student who was four decades younger than him, whom he married seventeen years later.
Næss died on 12 January 2009, at the age of 96.
In the 21st century, Næss came to be recognized by newer generations of philosophers as a pioneer of (a term that Næss himself used) for his empirical semantics research. One of Næss's early publications on experimental philosophy was "Truth" as Conceived by Those Who Are Not Professional Philosophers (1938).
Næss's main philosophical work from the 1950s was entitled Interpretation and Preciseness (1953). This was an application of set theory to the problems of language interpretation, extending the work of semanticists such as Charles Kay Ogden in The Meaning of Meaning. A simple way of explaining it is that any given utterance (word, phrase, or sentence) can be considered as having different potential interpretations, depending on prevailing language norms, the characteristics of particular persons or groups of users, and the language situation in which the utterance occurred. These differing interpretations are to be formulated in more precise language represented as subsets of the original utterance. Each subset can, in its turn, have further subsets (theoretically ad infinitum). The advantages of this conceptualisation of interpretation are various. It enables systematic demonstration of possible interpretation, making possible evaluation of which are the more and less "reasonable interpretations". It is a logical instrument for demonstrating language vagueness, undue generalisation, conflation, pseudo-agreement and effective communication.
Næss developed a simplified, practical textbook embodying these advantages, entitled Communication and Argument: Elements of Applied Semantics (1966), which became a valued introduction to this pragmatics or "language logic", and was used over many decades as a sine qua non for the preparatory examination at the University of Oslo, later known as examen philosophicum ("exphil").
Recommendations for public debate
Næss's book Communication and Argument (1966) included his recommendations for objective public debate. Næss argued for adhering to the following principles to make discussions as fruitful and pleasant as possible: "Avoid tendentious references to side issues"—distractions such as personal attacks, claims about opponents' motivation, or irrelevant explanations or arguments. "Avoid tendentious renderings of other people's views"—editing quotes or paraphrasing in a biased or misleading way (for example, quoting out of context). "Avoid tendentious ambiguity"—deliberately offering ambiguous statements instead of more precise ones (equivocation). "Avoid tendentious argument from alleged implication"—assigning views to opponents that they do not hold (straw men). "Avoid tendentious firsthand reports"—information that is untrue or incomplete, withholding relevant information (for example, lying by omission). "Avoid tendentious use of contexts"—presenting material with extra accessories of persuasion and suggestion such as visual or aural appeals to emotion of irony, sarcasm, insult, exaggeration, or subtle (or open) threat.
For many years these points were part of a compulsory course in philosophy (examen philosophicum) taught in Norwegian universities.
Næss's ecosophy can be summed up as self-realization. According to Næss, every being, whether human, animal or vegetable, has an equal right to live and to blossom. Næss states that through self-realization humans can become part of the ecosystems of Earth, in distinction to becoming only themselves. According to one writer, Næss defined the ethical consequences of self-realization as: If one does not know how the outcomes of one's actions will affect other beings, one should not act.
In an article that summarized Næss's career, Nina Witoszek noted that he qualified his most radical propositions using the rhetorical term "in principle", and he pragmatically recognized that, in Witoszek's words, "concessions are unavoidable; dogmas are ductile; and practice diverges from principle".
Selected works
Translation of Moderne filosofer.
"Not a direct translation of Arne Naess' 1976 work, Økologi, samfunn, og livsstil, but rather a new work in English, based on the Norwegian, with many sections revised and rewritten by Professor Naess".
(Review by David Orton, 2006) Vol. 1: Interpretation and Preciseness: A Contribution to the Theory of Communication Vol. 2: Scepticism: Wonder and Joy of a Wandering Seeker Vol. 3: Which World Is the Real One?: Inquiry into Comprehensive Systems, Cultures, and Philosophies Vol. 4: The Pluralist and Possibilist Aspect of the Scientific Enterprise: Rich Descriptions, Abundant Choices, and Open Futures Vol. 5: Gandhi and Group Conflict: Explorations of Nonviolent Resistance, Satyāgraha Vol. 6: Freedom, Emotion, and Self-Subsistence: The Structure of a Central Part of Spinoza's Ethics Vol. 7: Communication and Argument: Elements of Applied Semantics Vol. 8: Common Sense, Knowledge, and Truth: Open Inquiry in a Pluralistic World: Selected Papers Vol. 9: Reason, Democracy, and Science: Understanding Among Conflicting Worldviews: Selected Papers Vol. 10: Deep Ecology of Wisdom: Explorations in Unities of Nature and Cultures: Selected Papers
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Important facts
People in Arne Næss's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Arne Næss's
Frequently asked questions
Who was Arne Næss?
Norwegian philosopher and mountain climber (1912-2009)
When was Arne Næss born?
Arne Næss was born on 27 January 1912 in Slemdal.
When did Arne Næss die?
Arne Næss died on 12 January 2009 in Oslo.
What was Arne Næss's occupation?
Arne Næss was a philosopher, professor, mountaineer, writer and environmentalist.
What nationality was Arne Næss?
Arne Næss was Norwegian.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Arne Næss. https://biography.guide/arne-naess/
MLA: "Arne Næss." Biography.guide, https://biography.guide/arne-naess/.
Chicago: "Arne Næss." Biography.guide. https://biography.guide/arne-naess/.
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