New York Times: The Supreme Court heard arguments on Tuesday in a knotty environmental case over how to hold states responsible for air pollution that drifts across their borders and causes harm in downwind states. If there was consensus among the justices, it concerned only the complexity and difficulty of the issues before them. This is a tough problem, Justice Stephen G. Breyer said. A few minutes later, Justice Elena Kagan offered a similar assessment. This is a hard problem, she said. Still, the questioning...