The report is based on a review of published research up to mid-2009 as well as the input of independent experts world-wide. It recognizes that the research that has accrued over recent years presents a complex and uncertain picture of the risks and benefits of biofuels. The UNEP synthesis report attempts to clarify the picture by providing an accessible assessment of the science available to date.
Link: Towards Sustainable Production and Use of Resources: Assessing Biofuels