This week, arguments for and against what has been called the “most aggressively litigated environmental regulation in U.S. history” — the Clean Power Plan — were presented to the D.C. Circuit Court of Appeals. The rule, issued last year by the Environmental Protection Agency (EPA), sets carbon dioxide emissions limits for fossil-fuel fired power plants, and is so controversial that 10 judges, rather than the usual three, will hear oral arguments.

— The Hill