On June 23, 2014, the United States Supreme Court issued a decision, written by Justice Scalia, rejecting fundamental aspects of EPA’s “Tailoring Rule” and significantly curtailing the scope of the federal government’s power to regulate “greenhouse gases” (GHGs) from stationary sources. Utility Air Regulatory Group v. EPA, _____ U.S. _____, No. 12-1146 (June 23, 2014). However, the Court affirmed provisions of the Tailoring Rule regulating GHGs emissions from the nation’s largest stationary sources. Following the Court’s determination in 2007 that GHGs are an “air pollutant” subject to regulation under the Clean Air Act (CAA), Massachusetts v. EPA, 549 U.S. 497 (2007), EPA issued an “endangerment finding,” declaring that GHGs may “reasonably be anticipated to endanger public health or welfare,” and promulgated GHG emission standards…