Gore hits back at Geldof criticisms

Former US Vice President Al Gore has hit back at Bob Geldof's criticisms of his forthcoming Live 8 concerts, insisting the super gigs will be a "wake-up call for the world".

Gore's Live Earth gigs followed Geldof's Live Aid and Live 8 concerts in 1985 and 2005 respectively, which raised awareness of poverty in developing countries.