The future of world energy

Is the world about to run out of oil and natural gas? Peter Voser, the boss of oil company Shell, talks about how new sources of oil and gas are transforming the business. So does this mean that the fears that we were approaching what's known as peak oil - the moment we begin to run out of supplies - which were widely discussed just a few years ago were misplaced? We hear the debate with Kyle Cooper, director of research at the energy consultancy IAF Advisors and Simon Kalf from the Peak Oil Foundation of the Netherlands.