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As for the politics of possibility, Nordhaus and Shellenberger make a case for a massive governmental program in developing cheap, clean energy, as the Defense Department did with microchips or jetliners. It won't happen in the private sector alone, since they "rarely initiate technological revolutions," and there is actually very little innovation going on in the energy sector today. By contrast, when the Pentagon in the 1960s effectively guaranteed the market for microchips, it touched off a revolution that drove down the costs and spread the technology to many sectors of the economy. "An investment of roughly $200 billion would bring the price of solar energy down to that of coal," they estimate.

The authors adopt a politics of hope, rather than fear. "Cautionary tales and narratives of eco-apocalypse tend to provoke fatalism, conservatism, and survivalism among voters -- not the rational embrace of environmental policies," they contend. "Young and grassroots environmentalists are more inspired by the vision of creating a new energy economy than regulating the old one." Got that Al Gore?