Biomass seemed a very promising resource for substituting fossil hydrocarbons as a renewable source of energy and as a sustainable raw material for various industrial sectors. However, during the first decade of the 21st century, competition between the use of biomass for food and feed on the one hand, and for energy and industrial applications on the other hand, became a big issue. Dramatic food price rises in the first half of 2008 were blamed to the use of arable land for the production of first generation biofuels at the expense of food and feed. On purpose, the present report of the BACAS working group does not focus on the food and feed issue, but examines thoroughly the implications and limitations of the use of non- food (industrial...