Note the "corn" reference, and the increase in stuff needed to grow more corn for ethanol.
That's the problem...corn to ethanol, subsidies, lobbies, and the association with those two boondoggles to biofuels.
Petroleum always gets a free kick in terms of being millenia year old stored fuel, and the histrionics that we will go to to assure it's supply, but there are some (including in this thread) that use these studies to discredit biofuels, while advocating unlimited consumption of what must be a finite reserve.