Exxon Mobil Corp. is part of a growing coalition backing a carbon tax as an alternative to costly regulation, giving newfound prominence to an idea once anathema in Washington. Photographer: Robert Nickelsberg/Getty Images
Exxon Mobil Corp. is part of a growing coalition backing a carbon tax as an alternative to costly regulation, giving newfound prominence to an idea once anathema in Washington. Photographer: Robert Nickelsberg/Getty Images
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