BBC: High in the Andes, in a remote corner of Bolivia, lies more than half the world’s reserves of a mineral that could radically reduce our reliance on dwindling fossil fuels. Lithium carries a great promise. It could help power the fuel efficient electric or petrol-electric hybrid vehicles of the future. But, as is the case with fossil fuels, it is a limited resource. Lithium carbonate is already in the batteries of laptop computers and mobile phones. It is used …