Posted AT 4:20 AM EDT on 13/08/07
What travels to Canada in ocean freighters?
Ocean freighters have long been fixtures on the Great Lakes, but they're being buffeted by an unusual environmental storm.Many wildlife conservationists have begun to view the ships as enemy No. 1, blaming them for wreaking havoc on the fragile ecosystem of the Great Lakes by introducing many of its worst foreign-invader species, establishing flora and fauna in the world's largest continuous body of freshwater that resemble places as distant as the Black Sea and China.
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