News Posted February 12, 2009 Share Posted February 12, 2009 The greatest threat to the Great Lakes is aquatic invasive species coming to the region in ballast water from ocean going vessels. To date, more than 185 aquatic invasive species can be directly attributed to this cause, and the biological invaders' economic cost has been estimated at $5.7 billion per year.More... Link to comment Share on other sites More sharing options...
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