| http://www.w3.org/ns/prov#value | - Ships entering the Great Lakes should be made to kill all the creatures that hitch a ride in their ballast tanks, environmental groups said on Tuesday, challenging as too lax a proposed government standard to combat invasive species.Zebra mussels, spiny water fleas, round gobies and other invaders brought into the lakes in ships' ballast water have damaged the Great Lakes' $7 billion fishery and a
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