El Ejido is the centre for fruit and vegetable production on Spain's southern coast - an industry that relies heavily on cheap immigrant labour.

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Half a million smallholders in Ghana alone use such techniques, and in Burkina Faso they have helped almost triple vegetable production over the past 15 years.

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So, too, has global vegetable production as a whole.

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That's off of six and a half vegetable-production acres and 22 acres of pasture.

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Currently about 65% of vegetable oil in the European Union is being used for biofuel production, primarily biodiesel.

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