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How did the Romans ensure their fish arrived fresh? Why did refrigerated shipping containers revolutionise the global food supply chain? Susanne Freidberg, professor of geography at Dartmouth College in New Hampshire reveals the answers to the Ä¢¹½¶ÌÊÓƵ’s Mike Johnson. (Photo: Historical re-enactment of the founding of Rome, Italy. Credit: Giorgio Cosulich/Getty Images)
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