An Assistant Attorney General of Minnesota for more than twelve years, Barbara Freese helped enforce her state's air pollution laws and along the way became fascinated by coal and the larger story behind the smoke.
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The fascinating, often surprising story of how a simple black rock has altered the course of history. Prized as "the best stone in Britain" by Roman invaders who carved jewelry out of it, coal has transformed societies, powered navies, fueled economies, a... SEE MORE