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In a special business series, Hardtalk takes a closer look at the state of the global economy. Only a few years ago, biofuels seemed like a brilliant idea - grow crops to use as an eco-friendly fuel. Now though, many say they have become part of the global warming problem. Companies have invested billions into the industry. Sean Sutcliffe is the CEO of Biofuels Corporation, which owns one of the biggest biodiesel plants in Europe. Sarah Montague asks him about the sustainability of biofuels.