Old methods for the future
BBC Environment Correspondent Richard Black looks backwards to find the energy solutions for the future.
He examines some of mankinds oldest sources of power and heat, water, sun and fire, and looks at how the application of modern science to ancient techniques could help to plug the energy gap.
This is the third of a four-part Discovery series, "Fuelling the Future".
First broadcast: Wednesday, 01 March, 2006 at 1006 GMT
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