Woody Biomass for Ethanol (IMAGE) University of Washington Caption Depending on the way it is made, and considering everything that goes into producing it and how it burns, ethanol from woody biomass emits less greenhouse gas than an equivalent amount of gasoline, between 70 percent and a little over 100 percent less. Credit University of Washington Usage Restrictions Appropriate caption and credit required 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.