There was another blow to the cellulosic mandate this week as well as a new study challenging the notion that advanced biofuels reduce greenhouse gas emissions, specifically cellulosic ethanol made from corn stover.Cellulosic biofuels are facing some bad press this week. First, there was another blow to the cellulosic mandate as cellulosic fuel production did not meet its lowered required volumes in 2013. As a result, they were waived retroactively by EPA. In an order signed by EPA Administrator Gina McCarthy this past Tuesday, the agency will reduce the original cellulosic mandate of 6 million gallons per year to 800,000 gallons in order to meet the production level. Previously under the statute, refiners and blenders had to buy credits fr...