Large-scale production of crop based (first generation) biofuels may not be feasible without adversely affecting
global food supply or encroaching on other important land uses. Because alternatives to liquid fossil fuels are
important to develop in order to address greenhouse gas mitigation and other energy policy objectives, the potential for increased use of advanced (non-crop, second generation) biofuel production technologies has significant policy relevance. This study reviews the
current status of several advanced biofuel technologies. Technically, it would be possible to produce a large
portion of transportation fuels using advanced biofuel technologies, specifically those that can be grown
using a small portion of the world