A new generation of vending machines is ditching hydrofluorocarbons -- potent greenhouse gases long used as refrigerants -- in favor of cleaner options such as propane, ammonia and carbon dioxide. Some big companies have already switched to hydrocarbon-cooled vending machines, and General Electric is at work on a home-use refrigerator that uses similar technology. "The proof that natural refrigerants work is our grandparents had refrigerators charged with ammonia, propane and carbon dioxide," says Greenpeace research director Kert Davies.

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