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Ten Threats to the Great Lakes: The Earliest Invader

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This week we begin an extensive series on ten threats to the Great Lakes, with a look at some of the earliest invasive species. There are more than 160 non-native species in the Great Lakes basin. If they do environmental or economic harm, they're called invasive species. There are estimates that invasive species cost the region billions of dollars a year. David Sommerstein tells us how some of the region's earliest invaders got into the lakes.

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