Associated Press: Beneath the frozen plains of eastern Montana and Wyoming lie the largest coal deposits in the world _ enough to last the United States more than a century at the nation’s current burn rate. The fuel literally spills from the ground where streambanks cut into the earth, hinting at reserves estimated at 180 billion tons. But even here lawsuits over global warming and the changing political landscape in Washington are pummeling an industry that has long been the backbone of America’s …