As the hunt for new sources of domestic fuel intensifies in the face of dwindling world supplies, the energy industry has been quietly lobbying the state to open hundreds of thousands of acres in Lake Pontchartrain to drilling. The lake has been off limits to fuel producers since 1991, when the State Mineral Board first voted to ban drilling amid concerns about the lake's fragile ecosystem. The board, which controls drilling on state property, renewed the ban periodically until passing a permanent moratorium in 2000. Although the energy industry opposed the measure from the start, the ban has not faced...