On March 29, 2013, several environmental advocacy groups (“Petitioners”) filed a Writ of Certiorari with the Supreme Court of the United States (“Supreme Court”), requesting review of the U.S. Court of Appeals for the District of Columbia Circuit’s (“D.C. Circuit”) vacatur of the Cross-State Air Pollution Rule (“CSAPR”). Petitioners sought review on grounds that the D.C. Circuit exceeded its statutory authority in its decision, and its decision was inconsistent with court precedent.