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  • Battling over ballast

    Congress has tried to regulate ballast water in ships in order to stop the spread of zebra mussels, but so far loopholes in the law and tussles over policy have made the effort ineffective.

  • Tipping the scales towards native species

    In Unnatural Landscapes, Ceiridwin Terrill travels to four arid sites to show how scientists fight to protect indigenous organisms from invasive species

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