"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," according to ABC News .
"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 warming."
"The rule proposed by the Environmental Protection Agency last year requires states to cut carbon emissions by 30 percent by 2030... At issue before the court is whether the EPA has legal authority for its plan under the Clean Air Act. The agency and environmental advocacy groups have urged the court to throw the cases out as premature, since the agency won't issue a final rule until this summer."