Washingon – Associated Press – A divided Supreme Court on Monday ruled against federal regulators’ attempts to limit power plant emissions of mercury and other hazardous air pollutants. It’s a blow to U.S. efforts to inspire other countries to control their emissions as they approach Paris talks on a new global climate treaty later this year.

The challenge was brought by industry groups and 21 Republican-led states, which argued that the regulations were too costly for coal miners, businesses and consumers. The case is the latest in a string of attacks against the Obama administration’s actions to use the Clean Air Act to rein in pollution from coal-burning power plants.