How much should we pay to remove a single ton of carbon from the atmosphere? A new government task force is set to provide an official estimate -- and its results could be used to determine the scope of federal carbon regulations, as well as to justify stricter industrial air-quality standards. Still, not everyone thinks the estimate is a good idea: "You can't really quantify the social costs of carbon with any degree of confidence," says climate economist Gary Yohe. "You can get just about any number you want to, depending on the assumptions you use."
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