Cambridge physics professor D. MacKay has written a highly unusual book on “alternative energies” and our energy use. I just started reading, and it is probably the best I ever read on this subject. Numbers and not adjectives, precise and crystal-clear writing style… Even if you do not agree with his climate discussions, the book is a gem and should be your next reading. It is available in print and also (quite extraordinary!) as a free download (PDF file is 50 MB, 368 pages) on the web at http://www.withouthotair.com/Wiki.html.