Just 3 per cent of the land on Earth is still ecologically intact

A group of cheetahs in the Serengeti National Park, Tanzania

marth/Alamy

Most of Earth’s terrestrial habitats have lost their ecological integrity, including areas previously categorised as being intact.

Ecological integrity encompasses three measures of intactness. Habitat intactness is a measure of the extent to which people have made changes to the land, faunal intactness is a measure of the number of animal species lost from a habitat, and functional intactness measures the degree of functional densities of fauna, that is whether there are enough animals of individual species to effectively play their part in a functioning…



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