Coal: A Necessary Evil?

Twenty-five miners are known to have died in this week's massive explosion at the Upper Big Branch mine in West Virginia.  The effort to rescue four men still unaccounted for may be a lost cause. Even before this week's tragedy, the Obama Administration took aim at surface coal mining with a new set of environmental regulations. The loss of human life in the Upper Big Branch mine will likely produce new safety measures for methane gas deep underground. The coal industry and miners themselves claim new rules threaten their economic survival. Can coal mining be made safer and cleaner, or does America's appetite for energy mean putting up with so-called "hidden costs?"