In a unanimous decision, the U.S. Supreme Court has ruled that companies that voluntarily clean up pollution at Superfund sites may sue the federal government or other parties to recover some of the remediation costs. The high court’s June 11 opinion in U.S. v. Atlantic Research Corp. says that the 1980 Superfund law allows anyone except the U.S., a state or Indian tribe to seek to recover cleanup costs from another “potentially responsible party” at contaminated sites.