This chapter explores how post-apocalyptic climate change fiction gives readers access to imaginary environments, allowing them to experience posthuman spaces. Taking Margaret Atwood's Oryx and Crake as an example, it investigates the specific narrative strategies climate change novels may use to simulate inhospitable settings and threatening scenarios. The essay first argues, with recourse to Yuri M. Lotman's classical model of the spatial structure of narrative texts, that ecocentric novels foregrounding nonhuman materiality deprive the traditional concept of space of its function as a structuring principle of human culture. In a second step, the chapter shows how these texts negotiate such loss of anthropocentric meaning on the level of both narrative content and narrative transmission.