Carbon nano fibres made from from thin air

Every so often you hear about one of those scientific breakthroughs that sound like they might just change the world. So remarkable, in fact, that it sounds almost too good to be true. Professor Stuart Licht of George Washington University has just announced one such breakthrough. In a new research paper he claims to have found a way of manufacturing carbon nano fibres - literally from thin air. The BBC's Tony Bonsignore asked how his discovery came about.