Government eyes more coal regulations as black lung cases sharply rise among miners

One in five coal miners in central Appalachia with at least 25 years of experience has black lung disease. It is caused by inhaling toxic dust in and around mines and the most severe form is at its highest rate in decades. In June, the federal agency charged with overseeing miners' health and safety proposed cutting the exposure limit to hazardous silica dust in half. William Brangham reports.
Correction: This segment stated that coal mining is regulated by the federal Mine Safety and Health Association. The agency's correct title is the Mine Safety and Health Administration. We regret the error.
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