Uyuni Salt Flats, Bolivia. Photo: Ezequiel Cabrera/Wikipedia The coming boom in batteries to electric cars and Lazy Bikes (electric-assist bicycles) means a boom in batteries with which to run them. A new race for natural resources has begun. Enter Lithium, the world's lightest metal. For 150 years it's been nickel and lead that have been used in batteries but the advent of lithium technology has allowed for a revolution. Longer battery life, lighter batteries in our laptaps and mobile phones and iPods. Lithium weighs 1/20th of what nickel and lead do. Lithium is also used in anti-depressive medicine, ceramics and nuclear power. With all this talk of electric cars and bicycles, the demand for lithium is on the verge of exploding. Lithium is the new oil. Enter Boliva. This developing country sits on at least half of the world's supply of lithium, most of it in underground salt layers beneath the world's largest salt flats in Salar de Uyuni , in south-west Boliva. Betwee...