Ecological Irreplaceability in the Era of Nature Positive

Abstract

Global biodiversity decline has breached safe limits, prompting ambitious goals to halt and reverse nature loss. Meeting these goals requires a shift from minimizing losses to securing an absolute net gain of nature and biodiversity. We argue that foundational to this is respecting ecological irreplaceability—the recognition that some ecological assets, such as certain ecosystem types and habitat features upon which species depend, cannot plausibly be restored or replaced within timeframes relevant to the conservation of those ecosystems and species. Despite this ecological reality, many policy settings, particularly around environmental impact assessment and planning, are underpinned by the assumption that lost nature is replaceable. We outline ecological irreplaceability and its implications in the context of nature-positive ambitions. We show how it can be operationalized as the basis of a necessary, fundamental shift in biodiversity policy and conservation decision-making. Embedding the concept in policy is essential to safeguard the potential to achieve nature-positive goals and restore credibility to policy mechanisms that have too often enabled cumulative and irreversible biodiversity loss.