One concern behind the continuing biofuels market is the issue of biodiversity loss. In this thread, the Ecological Society of America did this meta-analysis to figure out the relative effects of the biofuel industry on different biodiversity losses. They found that vertebrate biodiversity is lower in biofuel crop areas, in relation to those areas that are untouched. This seems vastly obvious to me, but I guess they needed stats to show it as well. They also analyzed the differences by type of original flora, and found that corn affected the biodiversity much more than pine and poplar, and the birds seemed to be the most affected by land change effects.
Biofuels and Biodiversity Loss