蜜芽传媒

The Brazilan city of Sertaozinho is known as the country's ethanol capital. Brazil's biofuel programme has been a great global success, but when Daniel Gallas visited Sertaozinho he found that it is suffering, as biofuels struggle to compete with cheap oil. (Photo: Tractor harvesting sugar cane for bio-fuels in Brazil, Credit: Nelson Almeida/Getty Images)