Understanding Biodiversity Offsets
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A biodiversity offset is a conservation action, such as protecting or restoring habitat elsewhere, intended to compensate for unavoidable environmental damage caused by a development project, following the general principle that a project should first avoid harm where possible, minimise what cannot be avoided, and only then offset what remains.
For an offset to genuinely work, it generally needs to protect or create habitat of a comparable type and quality to what was lost, ideally within a reasonably similar region, since simply protecting any patch of vegetation somewhere does not necessarily replace the specific ecological value of the site that was actually cleared.
Offsetting remains a genuinely contested approach among ecologists, since restored or newly protected habitat can take many years to reach the ecological maturity and value of what was lost, and some ecosystem types are difficult or impossible to recreate convincingly elsewhere, which is why offsets are generally treated as a last resort.