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Many thanks to aiwendel for linking to something I read about late last year, and wanted to get hold of:

Sustainable Energy - Without The Hot Air

This is a book by a Cambridge physicist, which looks at different aspects of renewable energy, and different energy scenarios, and actually puts some serious numbers around them. In an age of hyperbolic statistics and emotive reporting, how welcome to find someone actually looking at what the possibilities actually mean.

( First paragraph of the Preface )