It catalogues areas of severe impact - in Ghana, the lion population in one reserve is down 90% in 40 years.
In West Africa, forest felling has restricted forest elephants to 6-7% of their historic range.
In Nepal, habitat loss and hunting have reduced tigers from 100,000 a century ago to just 3,000.
In the UK, the government promised to halt wildlife decline - but bird numbers continue to fall.
The index tracks more than 10,000 vertebrate species populations from 1970 to 2010. It reveals a continued decline in these populations. The global trend is not slowing down.
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