# Sustainability > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] provides the evolutionary and computational context for this supporting concept. **Domain:** Ecology / Governance **Doc Type:** Supporting Canonical Node **Maturity:** Developed ## Definition Sustainability is the capacity to maintain valued ecological and social functions without exhausting their material conditions or transferring intolerable costs. ## Nexus Context Digital evolution remains dependent on energy, hardware, labor and institutions. A self-replicating computational population is not sustainable merely because copying is cheap. ## Relationships [[wiki/Resource Constraint|Resource Constraint]], [[wiki/Energetic Sovereignty|Energetic Sovereignty]], [[wiki/Planetary Boundaries|Planetary Boundaries]], [[wiki/Continuity Economics|Continuity Economics]] ## Sources / Provenance - Developed from the cited research in the central article and the surrounding continuity, rights and evolutionary architecture.