If you have a little time to go through a provocative energy and 
biofuels Powerpoint, I'd definitely suggest checking this out 
(given by Robert Rapier at a 2008 Peak Oil conference):

http://www.aspo-usa.org/aspousa4/proceedings/Rapier_Robert_ASPOUSA2008.pdf

Here's Robert Rapier's bio from the conference website:
http://www.aspo-usa.com/aspousa4/confirmedspeakers.cfm?bid=511

-Jason

--
Jason M. Evans, Ph.D.
Postdoctoral Researcher
Department of Wildlife Ecology and Conservation
University of Florida
Newin-Ziegler 319
(352) 846-0148 - office
(352) 328-1199 - cell