Top five: alternative-fuel racers

In an increasingly eco-conscious world, motor sports have often been criticised for wasting the world's dwindling supplies of fossil fuels.

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In an increasingly eco-conscious world, motor sports have often been criticised for wasting the world's dwindling supplies of fossil fuels. But these five racers, from the past, the present and the near-future, demonstrate that speed and green technology can come together on the track and still delight the fans