Palm oil, used to produce biofuel, is being billed as a sustainable solution to the world's energy problems. According to an EU directive, by 2030 all petrol must contain at least 20% biofuel. But does palm oil deserve its 'green' reputation? What are the human and environmental costs of the explosion in palm oil plantations? This week's documentary investigates how palm oil cultivation is contributing to global warming. It reveals how indigenous tribes are being forced from their land, rivers and water supplies polluted and rainforests destroyed by a rapacious palm oil industry.