SciDev.Net: New biofuels offer a sustainable source of energy but we must consider the ethical and social implications, say Joyce Tait and Banji Oyelaran-Oyeyinka. Biofuels were first pioneered in the early days of car manufacturing. Cheap fossil fuels soon overtook them as our fuel of choice, but concerns about climate change have revived interest in them — global biofuel production doubled between 2000 and 2007, and is expected to double again by 2011. ‘First generation’ biofuels, …