The Union of Concerned Scientists released a report November 13 finding that as many as 353 additional coal-fired power plants in 31 states should be considered for closure as they become costlier to operate under new pollution control requirements. The study, Ripe for Retirement: The Case for Closing America’s Costliest Coal Plants, concludes that the potential retirements would be in addition to 288 coal-fired plants that are already slated for closure.