This essay considers and reflects upon the principle of causality and its relation to the global environmental crisis. Parting from some of Immanuel Kant’s views on causality and freedom as well as from Heidegger’s reading of causality in Kant, it asks some questions about the role of human activity in the principle of causality, the relation between causality and freedom, and in what possible different way we could interpret causality and environment. The essay proposes that instead of trying to decide on the subject of who causes the environmental crisis, and on the subject capable to solve it, one must turn the intention of inquiry to the very principle of causality and consider the need to rethink this notion today.