Desert Sun: The U.S. Supreme Court this week ruled that the Environmental Protection Agency may use the Clean Air Act to regulate major sources of greenhouse gases, such as factories and power plants. The agency wants to cut carbon emissions by 30 percent over the next 15 years. But the court added, in a complex opinion written by Justice Antonin Scalia, that the EPAs power is not unlimited. It bears mention that EPA is getting almost everything it wanted in this case, Scalia said. It sought to regulate...