In the last few decades we have seen the extraordinary rise of ecosocialist movements around the world inspired in large part by Marx's ecological critique of political economy. Marx was indeed influenced by some of the earliest attempts to develop what we now call an ecological-systems view, rooted in the concept of metabolism. Building on this perspective, Marx defined socialism as the rational regulation by the associated producers of the metabolism between society and nature in such a way as to conserve energy and to promote the satisfaction of human needs.