Unprocessed (straight) vegetableoil is unlikely to be a useful source of vehicle fuel on a large scale, and a studyundertaken by the Department for Transport indicated that unprocessed vegetableoil increased emissions of air pollutants and that the quality of the fuel is variable- suggesting it is not necessarily a clean source of fuel.The Scottish Executive supportsthe UK Government in the development of the Renewable Transport Fuels Obligationas a realistic means of developing widescale use of biofuel and carbon savings.