A four-year study of Hudson Canyon, a feature of the continental shelf off the coast of New York, “has produced maps that will allow scientists to study many things, including whether methane gas trapped in frozen sediment below the sea floor is escaping and exacerbating global warming,” the Associated Press reports (multiple sources: Globe and Mail, International Herald Tribune, MSNBC; Google News). Maps are available at the study’s web site as PDF files. Also via Cartography (from whom I’m stealing atrociously today).