From Scientific American, 60-Second Science Blog 9/10/08:
"Forget black holes. Here's the real question about the Large Hadron Collider: How fast could it defrost a pizza?
The forward thinking editors at Scientific American was all over this question in the June 2007 issue. Our staff made an estimate based on the rate and energy of particle collisions when the machine's two beams meet head on. (SA actually considered lead ion beams—which the LHC will begin circulating in a few years—which would impart more energy than colliding protons.) "... (continued)
Complete article: http://www.sciam.com/blog/60-second-science/post.cfm?id=how-long-would-it-take-the-lhc-to-d-2008-09-10