The three-member taskforce comprised Dr Harry Atkinson, formerly of the Science and Engineering Research Council and past chairman of the European Space Agency's Council, with Sir Crispin Tickell, Britain's former ambassador to the UN and Professor David Williams, from University College, London.

BBC: You are in: Sci/Tech

Branson has been particularly supportive of both Tickell and the film's producer Rebecca Harrell.

CNN: Fuel for thought: Film strives for energy answers