Ever since analysts began in the 1980s trying to calculate the social costs of our dependence on carbon-based fuel, the results have been questioned. In 2010, basing its conclusions on three federal models, the Obama administration set the social cost of greenhouse gas emissions at $21 a ton. That matters because it’s what is used by the Department of Energy to figure out, for example, the impact of tighter efficiency standards on kitchen appliances. It’s also what the Environmental Protection Agency uses to calculate the impact of vehicle tailpipe emissions.
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