Yesterday the Great Lakes Radio Consortium started a ten-part series called "Ten Threats to the Great Lakes" that explores dangers facing the world's largest body of freshwater. The first says that aquatic alien invasive species in the Great Lakes now cost the economy an estimated five billion dollars a year and that the cost is largely born by the taxpayers of the region. Two other programs are available (see links below).
GLRC: Ten Threats: Natives Bite Back
GLRC: Ten Threats: Predicting New Invaders

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