Rising corn prices due to ethanol prodution have forced farmers to remove 4.1 Million acres from CRP in 2007 to put into corn production. This is a 4.1 million acre loss of year round habitat, hunting, nesting acreage for all kinds of wildlife. It has also cause in 40% increase in the price of N fertilzer in the last few months ... which comes from petroleum and natural gas sources.

http://www.agriculture.com/ag/story.jhtml?storyid=/templatedata/ag/story/data/1173389267555.xml&catref=ag1001