alterre

Alterre is a term used to denote the idea of an alternate Earth or a different relationship between humanity and the planet. The word blends alter, meaning “other,” with terre, the French word for earth, and it functions as a flexible concept rather than a single, fixed definition.

In speculative fiction, Alterre commonly names a parallel Earth or an alternate reality with divergent ecological, technological, or political histories. Authors use it to explore how different choices or trajectories could shape environments, societies, and futures, often highlighting themes of sustainability, resilience, and cultural exchange.

Beyond fiction, Alterre appears in environmental philosophy, design discourse, and branding as a framework or aspirational goal. In these contexts, it signals a move toward regenerative practices that work with natural systems rather than exploiting them. Proponents may apply Alterre to discussions of urban planning, architecture, agriculture, and policy that aim to restore biodiversity, reduce carbon impact, and foster coexistence with ecosystems.

Because Alterre is not a standardized concept, its meaning is highly context-dependent. It may refer to a theoretical scenario, a practical project, or a cultural shift, depending on the author or organization using the term. In all cases, it centers on reimagining human–earth relationships toward more sustainable and equitable outcomes.

See also: alternate history, parallel universe, terraforming, sustainability, regenerative design.