Peter Lehner is Executive Director of the Natural Resources Defense Council (NRDC) and was Chief of the New York Attorney General's Office's Environmental Protection Bureau from 1999 to 2006. In that capacity, he was deeply involved in briefing Massachusetts v. EPA, 127 S. Ct. 1438 (2007), where the U.S. Supreme Court found that carbon dioxide (CO2) was a pollutant under the Clean Air Act and that states had standing to pursue claims arising from global warming. Lehner was a lead counsel in Connecticut v. American Electric Power Co., 406 F. Supp. 2d 265, 35 ELR 20186 (S.D.N.Y. 2005), pending on appeal, No. 05-5104 CV (2d Cir.), a nuisance action brought by several states against the five largest carbon dioxide emitters in the United States. The district court dismissed the case on political question grounds; the Second Circuit heard argument on the appeal in June 2006 and has not yet ruled. William E. Dornbos is an attorney with NRDC and serves as a Special Aide to NRDC's President and Executive Director.