Session VII - Energy Optimization II: no. 6At the time when the use of fossil fuel means ever increasing energy scarcity and environmental crisis in the world we live, we need greener innovations now more than ever. Growing attention has been drawn to biofuels such as ethanol and biodiesel and they have gradually taken up a certain amount of the total energy supply. Despite preferential development of them, environmental and ecological uncertainties still exist. Life cycle analysis (LCA), with deliberate system boundaries and life cycle inventories, has been applied by scientific literatures to calculate two principal functional units, the energy efficiency and GHG balance, from cradle to grave of different renewable ...postprin