The coal-powered S.S. Badger pulls out of the Ludington, Mich., harbor in August 2011. This summer is the first season that the Badger is operating with its new ash retention system, which passes EPA standards. Denise Stocker/Chicago Tribune/MCT /Landov hide caption

toggle caption Denise Stocker/Chicago Tribune/MCT /Landov

On Lake Michigan, A Cleaner Coal-Powered Ship Ferries On

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A shipwreck is seen near the coast in Lake Michigan, where clear waters recently allowed a Coast Guard helicopter to take striking aerial photos of several wreck sites. U.S. Coast Guard Air Station Traverse City hide caption

toggle caption U.S. Coast Guard Air Station Traverse City