| http://www.w3.org/ns/prov#value | - Some, including the Washington, D.C.-based Pure Salmon Campaign and 1planet1ocean, now advocate land-based, closed-containment systems.Carnivorous fish like salmon produce waste that falls through the nets and into the sea - a practice Don Staniford of the Pure Salmon Campaign says amounts to freeloading on the marine environment and not paying for their pollution.Closed systems that treat and r
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