Kaarlo Pentti Linkola was a prominent Finnish deep ecologist, ornithologist, polemicist, naturalist, writer, and fisherman. He wrote widely about his ideas and in Finland was a prominent thinker, and is linked by some authors to ecofascism and to authoritarian deep ecology. Linkola was a year-round fisherman from 1959 to 1995. He fished on Keitele, Päijänne and the Gulf of Finland, and since 1978 he fished on Vanajavesi.

Deep ecology is an environmental philosophy that promotes the inherent worth of all living beings regardless of their instrumental utility to human needs, and the restructuring of modern human societies in accordance with such ideas.