In a recent decision in In Re Methyl Tertiary Butyl Ether ("MTBE") Products Liability Litigation ("In re MTBE"), No. 00 MDL 1898, and related case City of New York v. Exxon Mobil Corporation, No. 04 Civ. 3417 (S.D.N.Y. July 14, 2009), the District Court for the Southern District of New York relied on the Supreme Court's recent decision in Burlington Northern & Santa Fe Railway Co. v. United States, No. 07-1601, -U.S.- (U.S. May 4, 2009) ("BNSF"), in holding that the defendants have the burden of providing apportionment under the commingling theory of liability in that environmental toxic tort case.