An entourage of Canadian coal mining executives pressed into the Lincoln County commissioners’ conference room last week to deliver promising news for Lake Koocanusa, the 80-mile long reservoir that straddles the U.S.-Canada border in Montana and British Columbia, and which has been at the center of both statewide and international efforts to reduce transboundary environmental pollution for more than a decade. “Selenium levels in the Koocanusa Reservoir are safe,” according to a PowerPoint slide summarizing a March 30 presentation by representatives of the global mining company Teck Resources, who made the trip to Libby to deliver the news in person.