The Red List Index (RLI) defines the conservation status of major species groups, and measures trends
in the proportion of species expected to remain
extant in the near future without additional
conservation action. An RLI value of 1.0 equates to
all species being categorised as 'Least Concern', and
hence that none are expected to go extinct in the
near future. A value of 0 indicates that all
species have gone extinct.
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