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A new book I highly recommend is
'Sustainable Energy - Without the Hot Air' by David
MacKay, a physicist at Cambridge University. You can
download it for free or buy a
hardcopy. Reviews from
The Economist and
Boing Boing echo my feelings.
MacKay's book is entertaining, insightful. witty, accessible, educational and no nonsense.
In his book,
MacKay mentions a book by another physicist,
Caltech professor David
Goodstein's 'Out of Gas', which I also recommend.