This essay explores the dynamic landscape of Anthropocene fiction, using novels such as John Lanchester’s The Wall and Sam J. Miller’s Blackfish City as lenses through which to explore the aftermath of climate change. Both narratives tackle the question: what unfolds in the wake of environmental disaster? Focused on the consequences of flooding, these novels depict worlds grappling with diminishing resources and an acute scarcity of habitable land, intensifying the challenges of overpopulation. In response, the remaining governments resort to authoritarian measures, fostering oppression and control. This exploration unfolds through the lens of four primary Anthropocene themes: climate change, overpopulation, authoritarianism, and rebellion. By examining how these novels navigate these themes, the essay contributes to the emerging field of Anthropocene fiction. Moreover, it highlights the urgent need for addressing climate change while underscoring the social justice implications embedded in these narratives. John Lanchester’s The Wall and Sam J. Miller’s Blackfish City serve as vital contributors to this literary landscape, shedding light on the intricate interplay between humanity and the environment in the face of Anthropocene challenges.