Biofuel uses the energy contained in organic matter - crops like sugarcane and corn - to produce ethanol, an alternative to fossil-based fuels like petrol.
But campaigners claim the heavily subsidised biofuel industry is fundamentally immoral, diverting land which should be producing food to fill human stomachs to produce fuel for car engines.
But all experts are at pains to highlight that the biofuel situation in Brazil and the US is very different. Find out how and why here.
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