Listen: Ballast Bluster (Hughes)-8342
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MPR’s Art Hughes reports that two Minnesota legislators are proposing a bill to guard against invasive species hitchhiking in ocean-going ships on Lake Superior. The legislation would require big international ships that travel in Lake Superior to treat ballast water before dumping it into the lake.

Ballast is the chief vehicle for the introduction and spread invasive species such as zebra mussels.

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