Learn about "clean coal" -- coal that can be burned without releasing carbon into the atmosphere -- in this NOW video. Coal powers half of America?s electricity and is both plentiful and cheap. What is the environmental price for this cheap energy? Explore the coal industry?s proposal -- called carbon capture and storage (sequestration) -- to separate and remove carbon dioxide from burning coal and inject it into vast underground rock formations, where ideally it will remain for eons. This investigation is part of a PBS-wide series on the country's infrastructure called "Blueprint America. "