@roger,
for starters:
http://www.news.cornell.edu/chronicle/99/1.28.99/Gold-book.html
http://www.amazon.com/s/?ie=UTF8&keywords=hot+deep+biosphere&tag=googhydr-20&index=aps&hvadid=3198650785&ref=pd_sl_4usf5r43ha_b
http://www.gasresources.net/HuntLetter-InfiniteEnergy,ed.htm
I first heard this thesis from C. Warren Hunt in the early 90s.
There was a sort of a flurry of items on this and similar topics on FR a few months ago and naturally enough those aren't turning up easily right now, I'll get back to this if I can find a few of them.
The basic principles of supply and demand are in part to blame: If demand for a good remains the same (or increases), and supply is reduced, prices will rise. In addition to being a staple for humans, corn is a chief component of livestock feed. So we can expect these higher corn prices to push grocery prices higher.