Yes. Thank you for the question.
I think there are large resources that are left over when crops are used for food—things like corn stover and wheat straw—that should be looked at as feedstock for biofuels, but there's a finite amount of land in the world and we really need farmers to, first and foremost, feed people. As we're approaching 10 billion people, I think we'll need all of our prime crops for people, and we should look to other biomass resources, including forestry waste such as from forest fuel-reduction programs. That's another source we should be looking to.