Next-generation biomass feedstocks for biofuel production

A review of the potential for biofuel production in the United States from timber and non-grain crops.
The development of second-generation biofuels - those that do not rely on grain crops as inputs - will require a diverse set of feedstocks that can be grown sustainably and processed cost-effectively. Here we review the outlook and challenges for meeting hoped-for production targets for such biofuels in the United States.