Suncor Energy (U.S.A.) Inc. v. Board of County Commissioners of Boulder County
1. Whether federal common law necessarily and exclusively governs claims seeking redress for injuries allegedly caused by the effect of interstate greenhouse-gas emissions on the global climate.
2. Whether a federal district court has jurisdiction under 28 U.S.C. 1331 over claims necessarily and exclusively governed by federal common law but labeled as arising under state law.