The Living Planet Index (LPI) is an indicator of the state of global biological diversity, based on trends in vertebrate populations of species from around the world.
The LPI provides the general public, scientists and policy-makers with information on trends in the abundance of the world’s vertebrates and offers insights into which habitats or ecosystems have species that are declining most rapidly. This information can be used to define the impact humans are having on the planet and for guiding actions to address biodiversity loss.
http://en.wikipedia.org/wiki/Living_Planet_Index
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