National Public Radio: The oil spill from the blown-out well off the coast of Louisiana is seeping into marshlands that serve as critical wildlife habitat and as buffers against violent storms. Officials are considering a range of cleanup options — including burning out the oil, and the marshes with it — but some of them may do more harm than good. At the Venice Marina in Venice, La., the scene on a recent day was one of summer serenity. It was a stark contrast to the sight of petroleum sliming the …