In a highly unusual action on Tuesday, the U.S. Supreme Court ordered EPA to halt implementation of its Clean Power Plan (CPP) rule—the centerpiece of the Obama administration’s climate strategy—while a 27-state challenge works its way through the courts. Perhaps the Justices learned a lesson from their recent experience with EPA’s Mercury & Air Toxics Standards (MATS) rule.  Because that rule remained in place during court challenges, by the time the Supreme Court ruled against EPA last summer, the majority of electric utilities had already made the irreversible investments needed to comply. Read more at Forbes.