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I have been sharing this new book written by a Cambridge Physics professor with some people and I thought I plug it here as well. Professor David Mackay has been looking and studying the current hype on sustainable energy and putting his scientific skills to test out various suggestions that have been published in public. He has written an easily readable account of his calculations and research on his website http://www.withouthotair.com
The online PDF document is a huge 403 whopping pages and it is still a draft. However I have read bits of it and I can certainly recommend it.