Jonathan Birch on the Edge of Sentience

Recent zoological research has shown us that a wide range of animals are likely to have sentience. We don't know for sure. There is sufficient evidence to think that it is likely that, for example, lobsters can feel pain. What should we do in the light of this? Jonathan Birch of the LSE,  author of The Edge of Sentience, discusses this important question with Nigel Warburton.