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                <term xml:lang="en">Alternative agriculture</term>
                <term xml:lang="en">Alternative sanitation</term>
                <term xml:lang="en">Fertilizers</term>
                <term xml:lang="en">Human excreta</term>
                <term xml:lang="en">Recycling</term>
                <term xml:lang="fr">Recyclage</term>
                <term xml:lang="fr">Excreta humain</term>
                <term xml:lang="fr">Engrais</term>
                <term xml:lang="fr">Assainissement alternatif</term>
                <term xml:lang="fr">Agriculture alternative</term>
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              <p>From its initial formulation as ‘circulus’ in the mid-19th century to the urine and faecal matter recycling projects that emerged at the beginning of the 21st century to address the crossing of planetary boundaries and its local consequences, the concept of agricultural recycling of excreta has spanned the 20th century. While the 20th century saw an exacerbation of the urban-rural rift, and the gradual end of traditional recycling practices in particular, criticism of these trends and their socio-environmental effects continued to rise in step with the crises generated by industrial growth. Although it lost its name, the Circulus utopia was reformulated many times in the century of the Great Acceleration. We find echoes of it among the promoters of biodynamic agriculture in the 1930s and 1940s, among certain socialist planners in the post-World War II era and in the ecologist and anarchist movements of the 1970s. By tracing the evolution of this ideal, this article sketches its history and attempts to bridge the gap between past and present excreta recycling utopias.</p>
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              <p>Entre sa formulation première sous le nom de circulus au milieu du XIXe siècle et les projets de recyclage des urines et des matières fécales qui émergent au début du XXI e siècle pour lutter, entre autres, contre le franchissement des limites planétaires et ses effets locaux, l’idéal du recyclage agricole des excreta a traversé le XXe siècle. Si ce dernier est celui de l’exacerbation de la rupture entre villes et campagnes, et notamment de la fin progressive des pratiques anciennes de recyclage, les critiques contre ces tendances et leurs effets socio-environnementaux n’ont cessé de renaître au diapason des crises générées par la croissance industrielle. Si elle a perdu son nom, l’utopie du circulus a ainsi connu de nombreuses reformulations au siècle de la Grande accélération : on la retrouve chez les promoteurs de l’agriculture biodynamique dans les années 1930 et 1940, chez certains planistes d’obédience socialistes de l’après-Seconde Guerre mondiale et dans les mouvements écologistes et libertaires des années 1970. En en suivant la trajectoire, les échos et les évolutions, cet article dresse une esquisse de généalogie, et tente de faire le pont entre les utopies passées du recyclage des excreta et les projets présents.</p>
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