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Is wildlife in decline?

It has been reported that wildlife populations have plummeted by 58% since 1970. If we continue this way the decline will be 67% by 2020. But do these numbers stand up to scrutiny? Can you really put a figure on wildlife decline and call it robust? Tim Harford finds out more.

First broadcast on More or Less, 6 November 2016.

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5 minutes

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