Business Green: The US government should step up support for the emerging cellulosic biofuels industry with a new tax credit regime that would reward firms based on the performance and quality of the biofuels they produce. That is the central recommendation of a new report this week from the Union of Concerned Scientists (UCS), which warns that the focus on first-generation biofuels such as ethanol has put a strain on agricultural resources while doing little to curb greenhouse gas …