The aim of this article is to construct a semiotic problematic of climate change in an anthropocene context. The composition is structured as follows. Tn the first section we propose a synthesis of semiotic perspectives on the Anthropocene from the fields of biosemiotics, ecosemiotics and anthroposemiotics. In the second section, two ontological-epistemological questions are posed with a view to anthropocene semiotics: agentivity and hybridity. Tn the third section, the three semiotic dimensions of climate change are highlighted: narrativity, temporality, and semiotic gradients. In the fourth section, we attempt to provide a grammatological perspective on weather and climate. The paper concludes with an in-depth study of the geopolitical dimension of climate change within a framework of political semiotics.