The ethanol frenzy started well before 2008. It was most definitely motivated in large part by a push from environmentalists to provide an alternative to fossil fuel.
There isn't a single environmental group in the top 10 corn ethanol lobbying groups, recently or long term.
For 2012 -
1) American Farm Bureau Federation & state organizations - $705,438
2) National Corn Growers Assn - $254,000
3) Cargill Inc - $247,500
4) Archer Daniels Midland - $227,850
5) POET LLC - $176,000
6) Biotechnology Industry Organization - $138,750
7) Growth Energy - $130,500
8) AG Processing - $109,000
9) National Farmers Union - $72,750
10) Louis Dreyfus Corp - $46,500
The major push in US ethanol use came from the Energy Policy Act of 2005. That bill was widely HATED by environmentalists, and widely championed by the energy industry.
The Union of Concerned Scientists said:
"Despite all of our hard work, however, the Congress chose to largely follow the path of a 19th century fossil-fueled past instead of crafting an energy bill for the 21st century that would lead us to a clean energy future."
National Republicans for Environmental Protection Association:
"It really gives a short shrift to conservation, and it still continues to subsidize the well-established oil and gas industries that really dont need subsidizing"