● It is a measure of the state of the world's biological diversity based on population trends of only vertebrate species from terrestrial, freshwater, and marine habitats.
● The index is given by the World Wildlife Fund in collaboration with the Zoological Society of London.
● The index has been adopted by the Convention of Biological Diversity (CBD) as an indicator of progress towards its 2011-2020 target to 'take effective and urgent action to halt the loss of biodiversity.
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