Associated Press: The centerpiece of the Obama administration's effort to tackle climate change is facing a high-profile legal test as a federal appeals court considers a plan that has triggered furious opposition from Republicans, industry figures and coal-reliant states. The U.S. Court of Appeals for the D.C. Circuit hears arguments Thursday in two cases challenging the Environmental Protection Agency's ambitious proposal to slash carbon pollution from the nation's coal-fired power plants that is blamed for global...