The name Élisée Reclus may not mean much, yet the famous 19th-century geographer, anarchist, and communard who took refuge in Brussels, Élisée Reclus, was one of the first theorists of human-nature relations. For him, humans are inseparable from nature, from which they originate. As a precursor of ecology, his thought resonates particularly in the face of climate change. It is pertinent to revisit his writings today. What do they reveal now that everything seems to have been said on these issues?