Recently, the term “Ecological Leninism” has emerged as a popular invocation in the works of Marxist thinkers attempting to grasp dialectically the numerous intersecting ecological crises. Yet, beyond a few introductory remarks, little has been said about the content of this concept and, even less, its relation to Lenin. Generally, the concept attempts to combine Leninist political theory with the ecological analyses of the growing number of ecosocialists and eco-Marxists working both within the academy and without. This paper intends an initial, philosophical contribution toward developing Ecological Leninism: (1) by providing an interpretation of Lenin’s philosophical method, that is, dialectical and historical materialism; and (2) explicating the way in which this philosophy gives rise to a political ecological theory and practice, Ecological Leninism, that addresses the crisis of the metabolic rift between nature and society. We intend to contribute to the development of Ecological Leninism by clarifying the philosophy through which the political method is articulated. Thus, we hope to show that, under the conditions of a global metabolic rift produced by capitalist society, Ecological Leninism as a political ecological theory signals the possibility of securing a just and sustainable world for future generations.