The kerfuffle over a world atlas that showed Greenland with significantly less ice cover than it actually has demonstrates the challenges of mapping ice. Jason Box, an Ohio State University associate professor of geography who is trying to tackle the problem, said accurate ice plotting can require costly trips to investigate the terrain. Changes in ice also can be hard to track, because old records often are not marked with specific dates, noted Graham Cogley, a geography professor at Ontario's Trent University.

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