A new index has been developed to help conservationists better understand how close species are to extinction. The Species Ability to Forestall Extinction (SAFE) index, developed by a collaborative research team, measures how close species are to the minimum viable population size. Of the 95 mammal species considered in the analysis, more than one in five are close to extinction, and more than half of them are at ‘tipping points’ that could take their populations to the point of no return.
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