(Reuters) -The U.S. Supreme Court dealt a setback to environmentalists on Thursday by allowing federal agencies to limit the scope of their review of the environmental impact of projects they regulate, as the justices bolstered a Utah railway project intended to transport crude oil. The 8-0 ruling overturned a lower court's decision that had halted the project and had faulted an environmental impact statement issued by a federal agency called the Surface Transportation Board in approving the railway as too limited in scope. The project was challenged by environmentalists and a Colorado county.