Saltsale

Stand in the middle of Salar de Uyuni , the world’s greatest salt desert, and the first word that springs to mind is ­nothing. As far as the eye can see, ­nothing. Not a shrub or tree, not a hill or valley, just an endless expanse of white.

This salt flat in Bolivia, the landlocked heart of South America, is a harsh and eerie landscape, perhaps the closest thing nature has to a void. From the Incas to the present day, humanity has made little impression here.

But that may be about to change. Dig down and you find brine – water saturated with salt – rich in deposits of lithium, the lightest metal.

As the invention of the pneumatic tyre turned rubber into a precious commodity in the 19th century, the world’s tilt towards greener energy is expected to do the same for lithium in the 21st. For years, tiny amounts have been used in laptops, BlackBerrys and other devices, but now its main use is expected to be in batteries for electric cars, which campaigners, manufacturers and governments say will – or should – replace petrol and diesel vehicles.

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