PHILADELPHIA — Turner — a town of about 6,000 nestled in the foothills of western Maine — may seem like an unlikely place for a revolution in refrigeration technology. Yet that is the location of a four-month-old store where Hannaford Supermarkets is testing the first supermarket refrigeration system in the U.S. that uses only a natural refrigerant — carbon dioxide — to keep its meat cases cool and its frozen vegetable cases cold. This transcritical ...

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