Eco-Marxism presents a debate between two theoretical schools: metabolic rift theory, developed by John Foster and others, and world-ecology, proposed by Jason W. Moore. The debate refers ultimately to ontology, more precisely to the relation between society and nature. Critical realism plays a central role as the philosophical underlabouring for metabolic rift theory and has implications regarding the Anthropocene/Capitalocene debate as well. Reviewing the debate through CR categories provides clarity about the specifically social character of the causes of ecological disruptions. (...) Using CR, metabolic rift theorists could explain the interdisciplinary character of their analyses. By distinguishing between real transfactual mechanisms and their actual interaction in open systems, I intend to show that neither metabolic rift theory, nor its interdisciplinary approach to the Anthropocene, involve Cartesian Dualism, as Moore claims. World-Ecology provides an alternative historical account of capitalism's environmental history, but it does not critically replace metabolic rift theory. (shrink)