The Danger Of Coal Ash, The Toxic Dust The Fossil Fuel Leaves Behind

Coal ash is a particularly dangerous byproduct of our dependence on fossil fuels. In communities that have dealt with coal ash spills, the incidents sparked concerns about toxins potentially seeping into water. Utilities have been pushed to adopt tougher safety standards -- but activists say the companies are resisting rules necessary for public health. Science correspondent Miles O’Brien reports.