Page last updated at 12:06 GMT, Sunday, 13 December 2009

Supporters claim Biofuel crop is 'green gold'

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An ancient plant is being cultivated in Tanzania as a lucrative biofuel crop.

The jatropha plant has even been used to fuel a 747, on an experimental flight.

But there are fresh doubts about whether it really is the "green gold" its supporters claim.

Egon Cossou reports.

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