In an interview with Brazilian magazine Margem Esquerda, John Bellamy Foster shares with Fabio Querido, Maria Orlanda Pinassi, and Michael Löwy the formative experiences that contributed to his work as a young activist and, later, a preeminent scholar of ecological Marxism. The interview concludes with a message to the ecological left in Brazil and elsewhere: “Whatever solutions there are to the present planetary crisis must, in historical-materialist terms, arise from concrete social formations...