Mumbai People for Ethical Treatment of Animals (PETA) has requested Bollywood superstar Amitabh Bachchan to ensure that non-vegetarian food is not served at the Live Earth India concert slated to be held in the city on December 7. In its letter to the actor, sent on Monday, PETA quoted what Dr Rajendra Pachauri, chairman of the UN Intergovernmental Panel on Climate Change and co-winner of Nobel Peace Prize told The Observer-