U.S. Supreme Court justices hinted they might revive one of President Barack Obama ’s biggest air-quality efforts, a rule that would curb emissions from coal-fired power plants in 28 states. In a 90-minute argument session today featuring analogies to last-second shots in close basketball games, the justices questioned contentions made by challengers to the Environmental Protection Agency rule, which targets air pollution that crosses state lines. The rule — struck down by a lower court and being tested by power companies, states and miners — has never taken effect. It would force companies including Texas ’s largest power producer, Energy Future Holdings Corp.’s Luminant, to either shutter old plants or invest billions of dollars in pollution-control technology. The administration says the rule would prevent as many as 34,000 premature deaths a year. The rule would use a modified cap-and-trade system to limit emissions of sulfur dioxide and nitrogen oxide […]