PHOENIX — U.S. food retailers testing commercial refrigeration systems that use carbon dioxide as a key refrigerant have found them to have a much smaller impact on climate change — but still carry higher energy and equipment costs — than a traditional refrigeration system. On the other hand, Sobeys, Stellarton, Nova Scotia, has been rapidly deploying a CO2 system, not yet used in the U.S., that is proving to be financially viable in addition to being environmentally ...

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