Could alternative energies also contribute to the Gulf's demise?

Click on this link to read an editorial column in the Sarasota Herald-Tribune (6-17-10) arguing that alternative energies such as bio-fuels will actually increase the "dead zone" in the Gulf of Mexico.  The article is by a member of the conservative American Enterprise Institute.  Do you agree with his concerns, or do you believe he makes certain assumptions about common practices that could be questioned?