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Unilever Ice Cream & Frozen Food has collaborated with Greenpeace to produce an eco-friendly freezer for Wall's. The units use hydrocarbon (HC), a natural refrigerant that does not deplete the ozone layer or contribute to global warming. Unilever currently owns 75,000 old-style freezers in the UK. The new models will be recognisable by stickers saying: 'HFC-free freezer better for the environment.' HC has been used in household freezers for some time, but this is one of the first instances of its use in high- performance commercial freezers. The new freezers also use up to 15 per cent less energy than traditional models to keep ice cream at the optimum temperature.