" If you want to understand who you are and where you stand in this maelstrom of churning values, you have first to understand how commodity values get created and produced and with what consequences—social, environmental, political and the like. If you think you can solve a serious environmental question like global warming without actually confronting the question of by whom and how the foundational value structure of our society is being determined, then you are kidding yourself. So Marx insists that we must understand what commodity values and the social necessities that determine them are all about. "

― David Harvey , A Companion to Marx's Capital