Independent: Sir Paul McCartney has teamed up with a Nobel Prize-winning scientist to urge people to become vegetarian to save the planet from the greenhouse gases created by rearing livestock. In a letter to The Independent, the musician joins Rajendra Pachauri, the chairman of the Intergovernmental Panel on Climate Change (IPCC), to blame worsening global warming on a rise in the number of people who eat meat. The musician and Mr Pachauri, who are both vegetarians, also believe that …