Biofuels Cycle (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Biofuel offers an alternative to gasoline that is carbon-neutral and can be produced in a sustainable fashion. Credit US Department of Energy Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.