Some U.S. retailers believe the solution to the emissions of HFC refrigerant is not to replace the refrigerant with CO2 or another low-GWP gas, but to simply tighten the refrigeration system so that the leak rate approaches zero. Retailers in the GreenChill program, for example, have succeeded in lowering their leak rates dramatically. But Bérubé questions how long a leak-tight system can remain that way. “I have stores with a 0.5% leak rate, but over the next 20 years ...

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