The next farm bill should include extensions of Cellulosic Biofuels Producer Tax Credit and the Special Depreciation Allowance for Cellulosic Biofuel Plant Property, Advanced Ethanol Council Executive Director Brooke Coleman wrote in a letter to Sens. Debbie Stabenow, D-Mich., and Pat Roberts, R-Kan., chairwoman and ranking member, respectively, of the Senate Agriculture, Nutrition and Forestry Committee. "Several billion dollars have been invested in advanced biofuels development with the expectation that Congress will stay the course with regard to its commitment to the industry. A tax increase on advanced biofuels at this time would curtail investment and undercut an industry just starting to close deals and break ground on first commercial plants," he wrote. Read the letter.