Political Philosophy, Economics, Ecology

Insofar as a Political Philosophy abstracts from spatio-temporal conditions, it abstracts from Economics, a system in which a society is rooted in a habitat that is the source of its resources.  So, Marx's Materialism does not merely restore Economics to Political Philosophy, it derives the latter from the former, because Economic activity is the foundation of all social relations.  However, Marxism conceives an environment as completely at the disposal of human Techne, thereby abstracting from the need to, conversely, adapt to a habitat, as well.  Thus, the Marxist concept of Economics is itself abstracted from Ecology, which studies the human species in all its interactions with its environment.