173 L. Ed. 2d 1208, 129 S. Ct. 2252, 556 U.S. 868, 2009 U.S. LEXIS 4157, 39 Envtl. L. Rep. (Envtl. Law Inst.) 20125, 77 U.S.L.W. 4456, 21 Fla. L. Weekly Fed. S 908