http://www.nature.com/nsu/031103/031103-18.html Sometimes, Google lets me down: full-text search of 3 billion documents is a wonderful thing, but if you only have generic keywords, Google isn’t able to do its thing. This article, which summarises two papers on the amount of pollution ships emit, contains a graphic showing pollution levels over the Atlantic; the shipping lanes are clearly visible. I’d like to see a similar map of the whole world, but specific searches (for the authors’ names, etc.) produce nothing useful, and all other search possibilities are hopelessly generic… (The “large image” link doesn’t work.) 14:10