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This book, published in 2010, deals with the unrealistic claims being made in many circles about our transition to carbon-free "green" energy. Smil does not write popular books - he writes carefully documented academic accounts of the real state of the world, and it requires some mental effort to follow all the various physics-based units of measurement. But it is worth the effort if one wants to understand the actual facts and constraints about transitioning to carbon-free energy, rather than succumb to the unrealistic ideology-based (rather than fact-based) fantasies being peddled in some quarters.