Business Green: First-generation biofuels are not only failing to deliver expected cuts in carbon emissions but also pose a significant health risk, according to a new study from the University of Minnesota. The study, published in this month’s Proceedings of the National Academy of Sciences, calculates that while second-generation cellulosic biofuels made from grasses and crops such as jatropha can deliver significant benefits, the economic costs to human health and well-being arising from …