Associated Press: Vast coal seams dozens of feet thick that lie beneath the rolling hills of the Northern Plains once appeared almost limitless, fueling boasts that domestic reserves were sufficient to power the U.S. for centuries.
But an exhaustive government analysis says that at current prices and mining rates the country's largest coal reserves, located along the Montana-Wyoming border, will be tapped out in just a few decades.
The finding by the U.S. Geological Survey upends conventional wisdom...