He published, on July 9, in the Nashville, Tennessean, a brief explanation that is worth a read. I don't faithfully read the (freely delivered--"complimentary-subscribed" to bolster the lagging print newspaper's circulation stats) news stats; but people keep coming up to me and saying things like "Wow, your father-in-law is really knowledgeable." So I want to reprint it now.
Unfortunately I can't, since in an effort to sequester information for sale to protect its profits, the Tennessean has relegated it to it's fee-based "archives."
Citizen-journalist that I am, I can publish excerpts, however; and I'm going to paste in a long bit from the archive copy I purchased right here, with elipses marking parts I edit out, with the caveat that I believe our own best hope lies not in domestic drilling or even exploration, but in rapid adoption of alternative energy sources, per Al Gore's moving challenge at Wecansolveit.org The article is copyrighted, per its citation below, but I share out this excerpt as a news item and in the service of education, as well as a link to the search results page where you may purchase the full article:
July 9, 2008
Copyright (c) The Tennessean. All rights reserved. Reproduced with the permission of Gannett Co., Inc. by NewsBank, inc.