More or Less - 20 Apr 12
Is the rate of species extinction exaggerated - or even unknowable?
Producer: Richard Knight
This programme was first broadcast on the BBC World Service.
Published on Friday, 20th April 2012.
Available Podcasts from More or Less
We are not the BBC, we only list available podcasts. To find out more about the programme including episodes available on BBC iPlayer, go to the More or Less webpage.