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But what if there was a way to make fish farms totally clean and green?
Several entrepreneurs say they're doing it. They're building fish factories on land, releasing almost no pollution -- vastly less, in fact, than the fish farms from which we routinely buy seafood currently.
They're working to overcome two different kinds of barriers: technological and economic.
The cutting edge of technology is Yoni Zohar's laboratory at the Institute of Marine and Environmental Technology in Baltimore.
More: The Future of Clean, Green Fish Farming Could Be Indoor Factories : The Salt : NPR