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Review: Planet of the Humans

Richard Heinberg

But the film does make some silly mistakes. Gibbs claims that a solar panel will generate less energy than it took to build the panel. That’s a misleading claim. Many teams of researchers have addressed the question of energy return on energy invested for solar power, and even the most pessimistic results (with which I mostly agree) say that the technology can yield a marginal energy gain. Much of that gain goes away if we have to “pay” for the energy investment entailed in providing batteries or redundant capacity. Wind power generally has a better energy payback than solar, but the location of turbines matters a great deal and ideal sites are limited in number. Assessing solar and wind power calls for complicated energy accounting, but the film reduces that complexity to a blanket, binary dismissal.