This document discusses an eco-materialist conception of history proposed by Craig Collins. It argues that Marx's materialist analysis of history can be updated by highlighting the role of ecology and energy in shaping societies and their modes of production. It proposes that societies adapt their productive forces and relations of production to metabolize particular energy bases, such as hunting/gathering wild plants and animals, domesticating crops and livestock, or exploiting fossil fuels through industrialization. Major transitions between modes of production occurred when societies' existing energy bases could no longer be sustained due to factors like climate change, population pressure, or resource depletion. The document examines how different energy bases shaped the economic base, superstructure, and dynamics of tribal, agricultural, and industrial